Armies that are bad for beginners are Tau, Tyranids, and Dark Eldar
Armies that are underpowered right now are Tau, Eldar, Daemons, and Orks, and Sisters
So try anything that arent those for your first army.
UNLESS YOURE COMRAD AND HAVE BALLS OF STEEL
but yeah, I lost a lot of games with tau before I actually got good.
and now im too good with my tau so people dont like to play me anymore, so i picked up IG.