I am not familiar with SportingBets and their blind structure and initial stack.

I play at pokerstars with 1500 initial stack so my answers relate to it.

Early stages:
AA, KK, QQ - raise preflop and try to get into HU.
JJ,TT - limp from early position, raise a bit from late position, call a raise of 2-3 BB if it will get you heads up
All other PP - Limp and fold if you dont hit the set.

AK - Raise, be careful of reraises
AQ - I usually raise those and it seems to be a profitable hand
AJ, AT, KQ, KJ - I will limp with those, if I am on the button and it is folded to me I will raise to try to get the blinds. Dont get too attached to those hands and be willing to throw them away to an aggression.

Suited connectors - I limp in early stages from middle/late position with SC 67 or higher. Those hands play very well on multiway pots if they hit.

Midgame is far more tricky to play because it highly depends on the players, stack sizes etc.., but a few general points.

1. You should have reads on players and adjust youe game accordingly
2. Notice how many hands do not get down to showdown - A lot of time is not about the cards you have - its about the cards they do not have.
3. Most of the hands seem to involve 2-3 players. SC are not a good hand at this stage, PP are - if you have 66 and you are HU with someone with 2 overs, 70% of the time he will miss the flop and you are ahead.
Blind stealing is important - With 5-6 players A9 and up are pretty good.

Regarding the A question - if there are multiple players in the pot then probably one of them has the A, if it is HU or you are playing vs the blinds then it is not neccesary.
If you have not shown aggression Preflop and the pot is small you can let it go, however if you have QQ, raised nicely preflop and got a caller, and a A hit you should bet, and be ready to fold to reraises.

As JefferyGB said it seems you are not agressive enough, and probably too tight.

Look at the amount of hands you play - A good rule of thumb is to play 1.5-2 hands per orbit, and as Jeffery wrote - raise most of the hands you play.
Post some hand histories from your bubble play, let people here analyze them