Class advice? What is there too much of, etc?

[Exavus]

I was thinking of playing a Shaman/Rogue/Necro but I have no idea if picking a certain class would ensure i'd never see groups or it would be difficult. Shaman seemed like the best choice because they aren't bad at farming for plat later on and they can be group buff/heals and very group friendly. Rogue seems like fun too because I always enjoyed not having to worry about spells.

Are there any bad moves I could take here or should I just pick whatever and roll with it? Is there enough grouping where it wouldn't matter what I played?

Thanks guys.