this might sound bit stupid but anyway,how i can start mod?i realy dont know how..

It depends on the mod. Some, usually older mods permanently replace your entire Soldat copy, so make sure you back up the original. Most newer 1.3 mods are placed in Soldat\Mods, where you activate them through some shortcut work (I'm too tired to repeat that; someone else fill 'im in).

Most mods come in with a Readme as to where to place their files. Try checking that out.

New mods are .exe files... comes with config and everyfing.

but honestly, back ur stuff up.

And learn how the mods work, so if it does screw up, you don't have to panic, or you won't post for help

Install it twice, like I did. After you get a good mod, you probably wont want to play normal, but hey, I did yesterday.