I would recommend to try and first keep your tree alive for a year or so. As you say this is your first bonsai, i'm pretty sure it will be inside, where it will have a good chance of dying soon. It will already be stressed from being moved from where ever it was to your place and will be more stressed from being inside, in a dry environment, likely on a windowsill on top of a radiator or some other heating device...
So, learn first how to take care of it, keep it alive, and take your time to learn how and when to repot. Good luck