First, you should know how to say hello with Chinese player(s).Usually you can say "Ni'hao"（你好） ,it just means "How are you?"or"Hello".
If you want to say"Can you hear me?Do you have mic?"Say"ting'de'jian'ma?neng'shuo'hua'ma?"听得见吗？能说话吗？
Or you can say "Cao'ni'ma"（草尼玛）,it means "F**k your mom".You can use it in most of FPS games.
If you want to say something different,you can say"Wo'diao'ni'ma'de"（我叼你妈的）,it means "F**k your mom too.
I suggest you say"China No.1"or"Zhong'guo'di'yi"（中国第一）,it is the best way to say hello with a Chinese player.

It is a basic you need to know.

• 0/1/2/3/4/5/6/7/8/9/10

0_"ling"零
1_"yi"一
2_"er"二or"liang"两*
3_"san"三
4_"si"四
5_"wu"五
6_"liu"六
7_"qi"七
8_"ba"八
9_"jiu"九
10_"shi"十

• decimal

It is same as English.
And point is "dian"点
For example
0.1_"ling'dian'yi"零点一
0.12_"ling'dian'yi"er"零点一二
0.123_"ling'dian'yi'er'san"零点一二三
0.99999_"ling'dian'jiu'jiu'jiu'jiu'jiu"零点九九九九九

• 11/12/13/14/15/16/17/18/19

11_"shi'yi"十一
12_"shi'er"十二
13_"shi'san"十三
14_"shi'si"十四
15_"shi'wu"十五
16_"shi'liu"十六
17_"shi'qi"十七
18_"shi'ba"十八
19_"shi'jiu"十九

• 20/30/40/50/60/70/80/90

20_“er'shi"二十
30_"san'shi"三十
40_"si'shi"四十
50_"wu'shi"五十
60_"liu'shi"六十
70_"qi'shi"七十
80_"ba"shi"八十
90_"jiu'shi"九十

• 100/200/300/400/500/600/700/800/900

Just like 20/30/40/50/60/70/80/90
100_"yi'bai"一百
200_"er'bai"二百or"liang'bai"两百
300_"san'bai"三百
400_"si'bai"四百
500_"wu'bai"五百
600_"liu'bai"六百
700_"qi'bai"七百
800_"ba'bai"八百
900_"jiu'bai"九百

• And 1000/2000/3000...9000;10000/20000/30000...90000 are same.

1,000_"yi'qian" 一千 000=”qian“千
10,000_"yi'wan" 一万 0000="wan"万
And....
00,000_"shi'wan"十万
000,000_"bai'wan"百万
0,000,000_"qian'wan"千万
00,000,000_"yi"亿**
000,000,000_"shi'yi"十亿
...
I think you don't need to use any nunber bigger then 9999999999.99"jiu'shi'jiu'yi'jiu'qian'jiu'bai'jiu'shi'jiu'wan'jiu'qian'jiu'bai'jiu'shi'jiu'dian'jiu'jiu"九十九亿九千九百九十九万九千九百九十九点九九 in a FPS game.

• How about ordinal number?

1st_"di'i"第一
2nd_"di'er"第二
3rd_"di'san"第三
4th_"di'si"第四
5th_"di'wu"第五
...
So you must get it
just add a "di"第.For example
999th_"di'jiu'bai'jiu'shi'jiu"第九百九十九

• 21/22/...36/...78/...

20+1_21_"er'shi'yi"二十一
20+2_22_"er'shi'er"二十二
...
30+6_36"san'shi'liu"三十六
...
70+8_78_"qi'shi'ba"七十八
Just like these.

• 101/102/...201/...507

100+0+1_101_"yi'bai'ling'yi"一百零一
100+0+2_102_"yi'bai'ling'er"一百零二
...
200+0+1_201_"er'bai'ling'yi"二百零一
...
500+0+7_507_"wu'bai'ling'qi"五百零七
Just like these.

• 121/...364/...587

100+20+1_121_"yi'bai'er'shi'yi"一百二十一
...
300+60+4_364_"san'bai'liu'shi'si"三百六十四
...
500+80+7_587_"wu'bai'ba'shi'qi"五百八十七
Just like these.

Just on the picture

• Erangel

We call it"Hai'dao"

• Miramar
  
  We call it"Sha'mo"
• Sanhok

We call it"Yu'lin"

• Vikendi

We call it "Xue'di"
Karakin

We call it......I don't know.Just call it"Ka'la'jin"or"Xin'tu"because it is new map.

AR_"tu'ji'bu'qiang"突击步枪
SR_"ju'ji'bu'qiang"狙击步枪
SMG_"chong'feng'qiang"冲锋枪
SG_"xian'dan'qiang"霰弹枪or"san'dan'qiang"散弹枪
MG_"ji'qiang"机枪

Grenade_"shou'lei"手雷
Stun Grenade_"zhen'bao'dan"震爆弹
Flash Bang_"shan'guang'dan"闪光弹
Smoke Grenade_"yan'wu'dan"烟雾弹
Molotov_"ran'shao'dan"燃烧弹
Most of guns doesn't have a Chinese name,so you can just call it in English.But some guns is different.
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photos from perfectworld

• Desert Eagle

Its Chinese name is"Sha'mo'zhi'ying".Chinese player usually call it "Sha'ying".

• Dual Berettas

Just call it "Berettas"or"Bei'rui'ta" but Chinese player usually call it"Shuang'qiang".

• R8

Just call it "R8" but Chinese player usually call it"Zuo'lun".

• AUG

I know many English players called it[ˈɔːɡə].But when you play with Chinese player,just call it "A'U'G".

• SSG 08

Our Chinese players called it"Niao'ju".

• AWP

Almost all Chinese players call it "Da'ju".

• G3SG1&SCAR 20

They has a same name in Chinese,"Lian'ju".

• PP-18 Bizon

Its Chinese name is"Ye'niu"

• Nova

Its Chinese name is"Xin'xing",we call it "Dan'pen"

• XM1014

We call it"Lian'pen"

• Sawed-Off

We call it"Fei'pen"

• MAG-7

We call it"Jing'pen"

• M249&Negev

They have a same name "Da'bo'luo",and you can just call Negev in English or"Nei'ge'fu"

• Knife

Just call it "Dao"
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Must guns in PUBG you can call its English name with Chinese players.
EXCEPT I SAID IN "GUNS IN CSGO"
Call their Chinese name.
That is it
Oh I forget these

crossbow_"shi'zi'nu"十字弩
pan_"ping'di'guo"平底锅

First aid page_"ji'jiu'bao"急救包or"bao"包"jih jiou bao"or"bao"
Bandage_"beng'dai"绷带"beng dai"
pills_"zhi'tong'yao"止痛药"jh ton yau"
drinks_"neng'liang'yin'liao"能量饮料or"yin'liao"饮料"neng liang in liau"or "in liau"
medicine case_"ji'jiu'xiang"急救箱or"yao'xiang"药箱"jih jiou siang"or"yau siang"
adrenaline_"shen'shang'xian'su"肾上腺素or"zhen'tong"针筒"shen shang sian swu" or "jhen ton"

Go to read "Cardinal number&Ordinal number 基数词与序数词"first
and
read this

xxx round_"xxx fa"xxx发
ammo_"zi'dan"子弹
5.56mm ammo_"wu'dian'wu'liu'zi'dan"五点五六子弹
7.62mm ammo_"qi'dian'liu'er'zi'dan"七点六二子弹
9mm ammo_"jiu'hao'mi'zi'dan"九毫米子弹 (millimeter_"hao'mi"毫米)
.45 ACP_"dian'si'wu'zi'dan"点四五子弹
12 gauge_"san'dan"散弹or"xian'dan"霰弹
.300 magnum_"ma'ge'nan"马格南

sentense:
I need some (AK/AR/SMG/7.62) ammo.
"wo'xu'yao'yi'xie(AK/bu'qiang/chong'feng'qiang/qi'dian'liu'er)zi'dan."
我需要一些（AK/步枪/冲锋枪/七点六二）子弹
SHABI, can you give me some ammo?
"SHABI,ni'ke'yi'gei'wo'dian'zi'dan'ma？"
SHABI,你可以给我点子弹吗？

iron sight_"ji'miao"机瞄
sight(holo/red dot)_"ji"miao"基瞄 （Like iron sight)
holo_"quan'xi"全息
red dot_"hong'dian"红点
scope_"bei'jing"倍镜 (x times_"x bei"x倍)
For example
15x scope_"shi'wu'bei'jing"十五倍镜
...
...
...
My homework are waiting for me.../sad