Chopper makes great points, and I totally agree. You could run 14/6 and still profit, I think. I've seen stats where guys run 17/12 and are absolutely crushing the game. However, it probably leaves a lot of money on the table, at least for most of us. Also table selection is probably a big part of their strategy.

Anyway, to answer your questions:
My blind steal is the same as my raise with a regular hand. My personal amount is 4-5x.

When you say "2nd barrel" I guess you mean cbet on the flop. I make it 1/2 - full pot, depending on the size. At 25NL, say I steal-raise to $1 and the BB calls. He checks on the flop. I don't like betting 1/2 the pot here, because it's the same as the preflop raise. I like to make it 1.50 at a minimum.

I steal a lot, and probably not as much as I should. Basically anytime it folds to me and I have something that's not total trash. I hate big-littles like K4, and I hate small unconnected cards like 36. I'd say anytime it folds to me and I have 45s+, 78o+, two cards over nine, any pair, any ace I'm stealing. And against a tighty, I'd say any two period.

I think you should steal against any range that often folds preflop or on the flop. Against very loose callers, I'm going to limp more often if I choose to play. For two reasons: 1) they're not going to let me steal. I can't push them off of pots. and 2) they call down big bets in unraised pots so I make a big profit flopping TPish hands and value betting.

You can steal from most positions in six max. Should be pretty common in CO and BTN.

I do not use different bet sizes by position. My bet is based on the table and the amount of limpers. Typically 4x + 1x per limper. If it's a loose table, I guess I don't steal a lot, but I would increase the amount of my raise if I decided to.