Starting Over - I need some advice

[ItalianFX]

I normally play 1/2 6-max or 2/4 6-max, but I'm a losing player and I'm leaking big time. It has been getting frustrating working on those bonuses, but still losing anyways. The last two days I moved down to .10/.20 6-max on Absolute, starting the table with $5, and leaving with less. I'm not writing this because I feel sorry for myself. I'm taking a stand and telling myself that I want to start over and do this right. I know variance is a big part of the game, but variance won't do me any good if I lose more than I win.

Bankroll does not matter, but let's say I have $500 and I don't want to have to reroll if I don't have to (being conservative).

My questions are:

1. Which limit (6-max) should I play to be able to survive a big downswing while getting the most out of my play?

2. What should I concentrate on the most, i.e., hand reading, preflop play, postflop play, pot odds? Or at least, what are the most important parts of +EV play?

3. What do I need to be thinking about during play, i.e., player's tendencies, HUD stats compared to their plays, blind stealing, blind defense...etc?

4. What should I NOT be worried about, i.e., short-term results...etc?

5. What should I do to study the game, i.e., continue playing as much as possible, review hand histories, respond on the forum to other player's hands, post my hands, read books?

I probably seem like a pest to most of you, but it is time to get as serious as I can about this game because I want to be successful ASAP in the right amount of time.

Here are some stats on my play right now (although very short-term):

Total $ Won: (310.35)
Total Hands: 8,890
Hours: 108.80
BB/Hr.: (1.38)
BB/100: (1.69)
VP$IP: 18.41

I know most of you can't stand posts like this, but I'm just asking for help. It's time to do things right.

And honestly, for the player(s) who help me out the most to turn my game around, I am willing to reward you for your time. I'm a man of my word. I'm not asking for a coach, but merely, someone to guide me in the right direction.