Do you have the coop purchase application? You should start working on that right away as there are many sections and information you will be required to provide. Good luck with everything.
Congratulations! I would like to add that it is important that your attorney is a NYC real estate attorney, one who is well- versed in the ways of coops and doing what is called due diligence (research/investigation) of the coop and it's finances.
The one thing you might want to find out about is what is involved with getting approved by the co-op board, and how strict or lenient they are. This does not necessarily have to involve your lawyer, but you don't want a closing date that is too soon if you have a co-op board that has strict requirements of when you need to have your application in by, and when they meet. If it's something like your application has to be in by the second Wednesday of the month, and they meet on the last Thursday, the soonest you would end up meeting with the co-op board is probably the end of March, because you probably wouldn't have your commitment by the second Wednesday.
Make sure you're comfortable with the answers your given and don't allow yourself to be rushed. If your attorney has another appointment and you don't feel comfortable with the answer given, don't sign. Rather, wait until you're 100% satisfied and understanding of all aspects of your purchase.
That's the absolute best advice I think I can give.
Congrats.! I'm very happy for you!
Eric M. Abrams
CA DRE# R01862927