yesss!! I did it!!! my kit works perfectly!
I wanted to share some info with you so members who are new to game editing like myself won't have to face the same problems as me. first of all download Drizzt1180's tutorial to kits (TeamBG), near infinity editor and backup your override dir and dialog.tlk. then read the tutorial and create your kit... now I'll explain how to fix the bugs I had:
1. No in game kit related text: when you add text to dialog.tlk with near inf it's added in the "No message data (0)" format so be sure to set it to "standard msg (3)" format.
2. No high level TOB abilities: Edit LUABBR.2DA, add your kit name to there and insert there the string from one of the classes that are already there. for example : "MYKIT.................Th0" to get high level thief abilities.
files that are also worth editing but aren't mentioned in the tutorial are DUALCLAS.2DA (dualclass permissions) ABCLSMOD.2DA (class bonuses and penalties to attributes)
and also XPLEVEL.2DA (set the amount of xp needed to lvl - thanx Sabre for the idea)