I've been working out constantly for like 15 years before starting gear, everyone's different though. 5 years+ in research constantly as well before deciding anything. Gotta weigh PROs and CONs of steroid use. Lots of to know for short/long term use, side effects, what to expect, how to deal with things if go sideways etc etc.
Always start just with Test alone. You want to know how your body reacts, if you take multiple compounds at once you not gonna know which one is causing what.
Have everything on-hand before you even start a cycle, PCT, Test, AI and so on. Have things even if you don't need them yet, better have and not need it than not have it when you need it.
Cycle length depends on what compound you taking, is it short or long ester.
Can do Test prop for 8 weeks~ (more frequent injections+ might be stronger PIP)
Can do Test E, C for 12 weeks~(twice a week is pretty standard to keep levels balanced)
You might need AI (Aromasin/Arimidex etc.) to control estrogen. Blood work before/mid/after cycle is good way to see how much you need.
Also HcG ( let you google it what is for, helps you to have more knowledge about cycles)
Also for PCT SERMs like Nolvadex/Clomid etc. When to start depends on what you running in your cycle and when was your last injection. Amount varies as well based on test volume.
There are lots of things to consider when starting cycle, need plenty of research as well if want to do it properly and as safe as possible.
Also, it would be much easier to help you out if you provided more stats like age, weight, height, goals, training, diet etc.
Could also plan the cycle and post the layout here after some research so people can give advice of what's good/bad with cycle.