Sona mid or top
I've played a couple games. 2 of them were sona mid and 1 sona top. In my 2 mid game's i've played against akali and Oriana. Akali was really easy to lane against, poke, and kill. I harrassed her constantly and won every trade. Oriana was a little bit tougher to lane against because of her Q and W, but my jungler helped me out a lot, leading to me getting fed. I played against a Teemo top and it was easy. My passive still hit and counted even when I was blind. I always find Teemo the easiest to lane against because he's really weak.
I Started with
and then bought
and
. second back got
. Then you have to build
at some point. Now build whatever the heck you want. I think
is a very good item to have because of the massive range on your heal plus the passive of the item. I max q then w and lastly e. I helped my team out a lot in team fights and kept them alive, while doing massive damage to the enemies.
If you get auto filled to mid or top and don't know who to play, i recommend Sona.