Where can i find lock on addons like effecs and textures

Here
http://www.lockonskins.co.uk/

Also try:

http://www.lomacfiles.com/

This site is partially in German, but you can understand the important stuff easily enough!
http://www.skin-world.de/lockon/lockon.htm

http://www.combatace.com/

Don't forget to grab and install LOMAN v2.1 (Lock On Manager) for wicked easy mod installation. Try it once, and you'll never go back.

Good luck,

-Chris