Well, first off, welcome.
This is what i can tell you. I don't have a squad (but i thought it would be cool to have a little group to practice and squad up with), so you can consider me a "solo" player. Having a team would be a plus, though. As far as arms and gear, Get what you think you would need... but keep in mind the essentials. I personally carry 3 spare mags for my AK (they're standard 70rnd mags, and i don't get trigger happy), a GBB sidearm with a spare mag, and a rig to carry the mags in, as well as a speedloader, deathrag, bag of bb's, etc. It just depends on what kind of shooter you are. If you go through a lot of ammo, get a lot of mags, unless you decide to go HI'Cap... I just got the rig i have about a month ago and also carry a camelback. The official games are huge, and in the summer heat, i would highly suggest hydration. You're also going to need some BDU's. Might as well pick up a set of woodland and desert, since the teams at most games are distinguished by the BDU color. And if you don't already have a good AEG, i would suggest you pay $200-300 for a good one. You really get what you pay for in airsoft if you didn't already know that. Tokyo Marui, Classic Army, etc... the "high-end" companies have what you want.
Any other questions, feel free to ask. And if there is anything i missed, someone here will help you out.