After an arrest, there are many legal events that happen prior to you ever appearing in court to plead guilty or not guilty. There are several initial hearings including a hearing to set bail so that you can return to your life during court proceedings. There are even more legal steps that happen early on that will affect how the trial eventually goes and how prosecution will proceed.
Early in the process, it is probably a good idea to seek out US pretrial services so that you can obtain the best defense even in these early stages. Your attorney will be able to use this extra information to help attempt to get you released on bail and to help prepare for pretrial motions. This early assistance can help your attorney later on by setting up the way information is gathered for your case.