Rich,
As for mentors: I think one thing you'll find as you go to these meetings and show genuine interest in learning and doing, you will find people are often willing to help you, guide you, offer advice, etc. At least that is how it goes here in the west. New York may have a different attitude. Sometimes as you meet these people you will find out what they are doing and you can find ways you might be able to help. Often, offering assistance at no cost will help you get a foot in the door with someone else already doing it successfully. If you can, you've got a mentor. Learn by watching and being around them. I am sure you have something of value to offer, even if it is just the ability to hand out door hangers or manual labor. You can offer aid somewhere and this will help you be of value to someone that is already successful as a real estate investor. It doesn't cost you $$ but it might cost you time and effort. However, when you may not have cash to spare, this is a good start.
As for Costs: You will also find out that in these meetings there will be contractors and discussion about rehab costs, etc. You might be challenged to evaluate a property. Even if you don't know how you will hear how others are doing it. A lot of work is calculated by the square foot so you just need to know what the costs are for different products and services. For example you'll get a feel for flooring costs on a per square foot basis or paint can be estimated on a per square foot (roughly). You may find you need a contractor in your back pocket who will be the one to do work for you once you start bringing it in. If he believes you will indeed be a good source of referrals and work, he can help with giving you quotes and costs on things. Wouldn't hurt to find a good way to work with a good contractor. Again, a good reason to begin networking at these meetings.
I would say go to the meetings prepared, look serious by dressing like you are serious and present yourself with confidence. Ask questions. Humility will go a long way.