Medication is mostly trial and error. What works well for you may not work well for somebody else and vice versa. You're not likely to get on too high a dose initially since they're going to want to start at a low dosage and increase as needed. You're also not going to get everything resolved at your first appointment. It doesn't take long to get results but it does take time to get everything adjusted.
Stimulants are a typical first line of treatment for ADHD. They do the job well, for most people, once you get everything dialed in, which can take a few months in some cases. Avoid caffeine, at least when you're starting out unless you like "overwhelming feelings of impending doom."