What sort of weight training

Hi,

Hope some you can help me with this,

I started doing mainly cardio (cross trainer, treadmill) and have recently added some minor weight training (if you can call it that). I'm trying to tone my abs and pecs as I have a bit of flab and small man boobs from losing over 60 lbs. Not a lot but enough that I need to tighten it up. I am mainly doing crunches for the abs and butterfly dumbbell lifting (?) for my pecs

What I am looking for are some suggestions as to what I SHOULD be doing to tighten this up and what weight should I start out and how I will know when it is time to increase weight/resistance.

Sorry of these sound like simple questions but I just want to get it right

Thanks

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