I look for tables with the highest %players seeing flop and highest pot size. Also i like at least 7 players at the table.
I would rather have a table where both stats are quite high than 1 very high and 1 tiny.
After i get a place at a table i just sit down. I usually recognise a few of the players so i just post the newbie blind and play. If i dont ill wait till the blind gets to me so i can see who is in all the pots and who is raising them all.
I dont bother observing a table before i sit down for more than a couple of seconds but i dont start blind stealing or playing hands like KJ until ive been there for a few orbits until ive started to learn what the players are like.
I mostly just camp sets, AA, KK, QQ, JJ and AK, AQ AJs until i know the players