#1

I'd proabbly raise this to knowck out the blinds if possible. Depends on the table, but I'd ratehr pay two bet to have two opponents than one bet to be against four.

Fold the flop: you are getting 7:1 (and not closing the action) meaning you need 6 outs. You don't have six because youre 3 Ks and 3 Js are probably tainted. Barring that, fold the turn.

#2
I don't like playing KJo agaisnt a tight player OOP. As you played it, a flop bet or intended checkraise are good. I would fold after MP1 raised the turn. MP1 does not have a jack (otherwise would have raised flop because there were 2 spades), and I believe s/he has a queen. You only beat AK and 88-TT here. After the river, you are never winning this.