To start with DPS classes are the best who do most damage to 9 tails, Lightning/Fire/Wind, pick whichever one looks most interesting to you, in terms of power Lightning is probably strongest 1-60, it's the one people complain most about on new servers, then once all passives unlock they balance out. Earth and Water are great later on but they are the worst of the bunch at low level, better pick damage class and try them once you reach lvl 60.

Well early on you don't want to draw because later treasures are much better so you will end up using same easy to get ninjas as other people, but low levels go very fast. Once you get 60~ and have most purple pets and more ninja choices you can start making whatever teams you want.

Yeh those are all good early ninjas, and they are light so it's normal that they are popular in light teams, not all 3 together though lol, something like Hinata/Sasuke/Karin or Guy/Hinata/Sasuke are popular early light teams, also normal team 7 upgraded works pretty good for light, better then all other mains early on.

For wind Kankuro is very good, especially if you recharged for Gaara. Something like Kankuro/Gaara/Guy will one shot people lower power then you, and almost one shot people same power early on and then there is the usual empress team Karin/Hinata/Kurenai for mid game.