I am new to these forums, so let me know if I am posting this question in the wrong forum.

I was playing in a NL ring game with 5 players. I am the small blind holding 78suited. Blinds are $.25/.50. The guy after the big blind bets $2. Everyone calls.

[Question 1]: Is it correct to call $1.50 from the small blind with low suited connectors when 3 or 4 other players (depending on big blind's actions) are in the hand?

Flop comes 7 8 A rainbow. I check, hoping to checkraise my two pair. Everyone else checks.

Turn comes 7 (suited with the A). So board is now 7 8 A 7. No three-flush. Since I have the full house now, I am confident that if nobody bets, a free card at the river is very unlikely to give anyone a hand better than mine. And also I think someone will put in a bet, since I am playing at a relatively aggressive table.

[Question 2]: Was checking a good play here, or should I have bet? If so, how much? (There is $10 in the pot now).

Anyway, after my check, big blind checks, next guy bets $3, next guy raises to $6, next guy folds. I think am most likely up against pair of Aces with high kicker, or possibly even pocket 88. Pocket A7 and A8 seem unlikely to me, given the pre-flop raise and the players I am up against. I am not worried about other suited connectors with a 7 in them, because they will lose to me or tie at best. For some reason, pocket AA doesn't cross my mind. So, I raise to $12.

[Question 3]: Was this re-raise a good move? Should I have put in more than $12? Slowplayed and raised on the river? Should I have given serious consideration to AA and cautiously called or folded?

Anyway, big blind folds, the other two call. There is $46 in the pot at this point, and it is just me, the original pre-flop raiser, and the guy that raised on the turn.

River card is 8. Board is now 7 8 A 7 8. The final 8 is not suited with the onboard A7, so no flush is possible. I now know that it is not possible that either of my opponents has pocket 88. I think I have the best hand with eights full of sevens.

Since I re-raised the turn, I decide to start off the round betting (thinking that if I try to checkraise again, they will both just check). I go all-in for just over $35 (remember the pot is $46). Both the other players call (first guy has more than enough to call my full bet--second guy is all-in for less than my full bet).

Showdown. First guy (who put in the original pre-flop raise, and the initial bet on the turn) shows AA. Next guy mucks (I plan on looking at the hand history later to find out what he had). I muck and am now down about $50.

[Question 4]: Should I have deduced that one of the other two condenders had AA (especially the pre-flop raiser) after they both called my re-raise on the turn, or was all-in the right move on the river? If all-in was not the right move, what is the appropriate move here? Check and fold to any large bet? Bet small? Something else?

[Question 5]: Any other mistakes in my play this hand? Excluding bad beats, this is the most money I've ever lost in a single hand, so I'd really appreciate any input on whether I played it correctly or not.