Everyone should get these mods/maps for arma, check out the list.

TUTORIAL ON HOW TO INSTALL MODS:

OPTION 1 ( The way I install mods ) http://www.youtube.com/watch?v=1r2O5Azw6EU

OPTION 2 - EASIER ( Toms version of installing mods )
Ask Tom.

CBA (needed for ALL mods, get it!)
http://www.armaholic.com/page.php?id=6231

JSRS Sound Mod:
http://www.armaholic.com/page.php?id=11549

BlastCore FX:
http://www.armaholic.com/page.php?id=12975

st_movement v1.7z (Fixes ♥♥♥♥♥♥ glitches when you walk through doors):
https://dev-heaven.net/projects/shacktac/files

MAPS:

Thirsk:
http://www.armaholic.com/page.php?id=9861

Podagorsk:
http://www.armaholic.com/page.php?id=8791

Clafghan:
http://www.armaholic.com/page.php?id=15580