i would start with a class you already know. watching some build videos will help to understand, why some skills are recommended and used by others. if you want to start on a new class, you rather need to decide what your play style is. do you prefer fighting melee or ranged. do you want to rely on damage shields, having several heal over times or burst heals to keep you alive?
most stamina builds are played melee and use healing over time like vigor and momentum. with the morph really you also got some kind of burstheal. stamden has also a burst heal in its toolkit.
the only class working ranged on stamina is a nightblade sniper and somewhat stamden with throwing birds.
the magicka melee classes are templars and dragonknights. both kind if heal by damaging the enemies, while the templar has a huge burst heal to save lifes.
for the ranged magicka classes we got sorcerer, nightblades and magdens. they all play similar using damage shields. nightblades also have cloak, pretty unique and therefore are kings of the kiting technique. but overall they play similar with some different flavors. same with all stamina toons, they mostly rely on the same healing and do melee damage with different looking animations.

For a gankbuild all three races fit pretty well. Khajiit has also fitting passives for a sneaky class. You should defintely check out some buildvideos about nightblades then;)
Btw ganking means bursting somebody down in a few hits. Mostly this is done from stealth. Thats why nb‘s are the gank class, since they can go invisible with cloak. But most builds differentiate between ganking and bow ganking.