I think I check here regardless if I have 77 or AKs since it is my 1st hand at the table and I don't really have a read on anyone yet.
Raising with 77 isn't the best idea, and you are mainly playing this hand for set value, this you want as many opponents as possible, so raising would reduce that.
AKs is not a made hand, but you are ahead of all unpaired hands, so I would not be opposed to raising. However, if you are called, you are going to be playing the rest of the hand out of position, which makes it difficult, especially when you only sit down with 25 BB's...
I would just check and hope I hit a piece of the flop.