23.07.2015, 23:27
This is going to sound a bit strange but I recommend downloading an already created gamemode, http://forum.sa-mp.com/forumdisplay.php?f=71, taking a look at how it's done and trying to make changes, take a look at the wiki to research a couple of functions, then when you feel ready try and make some simple filterscripts / gamemodes of your own. 