Early morning ramblings.
Some is more general as there’s going to be other new players all having the same “what do I want to be?” questions.
The ships of the four main Factions do feel different to fly - much to CCP’s credit - although as others have commented you are not locked to your starting Faction. Indeed, you may start Gallente and at some point join a corporation where the doctrine is built around shields and missiles (more the Caldari line) or an Amarrian Golden Fleet style of doctrine. The initial differences can be cross trained out in a few days if you need to. Indeed there are even slight differences between the bloodlines within the Factions - it’s a deep game as you probably already know.
It’s more “can I build an avatar I can live with?” - the race, gender and bloodline AND YOUR NAME are fixed and can not be changed. Your bone structure is also largely fixed, but a resculpt certificate can cure that (currently about 500m ISK - a lot for a new player). Only the cosmetic stuff; clothing make-up, hair and a few other bits, can be changed freely.
So, call yourself, say “WombatButtKicker” and ten years from now (not uncommon in Eve) you’ll be thinking - I wish I’d been less crazy. You invest a lot in your character - time, effort and emotionally. You may as well not end up embarrassed every time someone mentions you.
Eve is played in many ways, and has a deep in game story and history as well as the history and empires pilots (Capsuleers) have made for themselves. There is, unsurprisingly, a reasonably large Role Playing (RP) community - the “Intergalactic Summit” part of these forums is where some of that goes on. There’s deeply confusing stuff in there, but some good guides.
Of the Empires, Amarr has the largest active RP community - the oldest corporations are Amarr Loyalists.
You can make three characters (“Alts”) on an account - you can’t fly them at the same time, and normally only train one at a time, pushing skills from one to another is limited and expensive. But they provide options to try something and restart or have a different character for a different purpose. People often have a neutral character for errand running in high-sec - hauling stuff around, trading and so forth. Doing stuff a character embedded in an “at war” corporation may find less safe or easy.
There are many people playing Eve in different ways. Jump into the pool - it’s all “deep end” but the water’s lovely and once you get over the initial panic and disorientation you’ll do fine.
Welcome back to New Eden.