thx for the replies. i have one more question: how should i distribute the points? i usually score around 105 per game.
I suggest playing a couple of games to get the feel of your team, so you can distribute the scoring accordingly. But, since you asked for specific suggestions, here goes:
T-Mac is obviously going to be your go-to guy, scoring the most ppg. Whether you have him score 30 ppg as he does in real life depends on your style of play/personal preference.
I suggest Stoudemire as your second option, followed by J-Rich off the bench, or possibly Wagner. Swift and Miles should not be ignored - you could probably have your whole starting 5 averaging around 10 ppg (with McGrady and Stoudemire leading).
the thing is, i dont want to make guyton my 12th man because hes one of the best 3 point shooters in the game (93) and my squad is sorely lacking in 3 point shooters.
I understand that, and it's your team, I'm just throwing my two cents in.

The only problem with using Guyton as your backup PG is that either Dixon, J-Rich or Butler will have to play fewer minutes - and they're all better players than Guyton. You have to consider what everyone brings to the table - it might be worth sacrificing three point shooting for more all around talent.
But again, it's your game, your preferences, your playing style. I could very well be giving you advice that won't work with your style of play, so do what you feel is best.

You probably will have to play a few games before you can truly decide on a subtitution pattern, scoring distribution, etc.