If you call the Agudah at 212 797 9000 they have great contacts with all types of (frum) lawyers. They were a great help to me B’H.
BTW- are you filing an I-485? I did it mainly on my own and would be happy to walk you through it.
Also there is a non-profit organisation called NYLAG that provides legal help free of charge to low income people. I did the I-485 myself and then had a NYLAG lawyer look it over for free- she was really nice and very good at it (proof: I got my GC 4 months later).
In gratitude to HaShem for getting my GC I try to help ppl get theirs in whatever way I can as a chessed (ie help writing the petition letters, looking over forms, paperwork etc).
Mods: Am I allowed to post my email address so I can be contacted with questions?