Whatever equipment you decide to bring with you, remember to make sure it is in working order before you bring it along. Having your equipment fail on you during your session could be a disastrous this could be to your recording session.
You should also be sure to bring any wires that you would normally use with that equipment because the recording studio may not have them. Most studios have a list of equipment they have on site on their website, you should browse this list and get an idea for what mics you will be using while you are there. If you lack experience with Mics, check out our guide on the best microphones, and their types and uses.