So I think I would like to be an engineer but I don't know what exactly that would entail at this time. my second choice is The Commandos since I love FPS and as of right now I am a pretty bad pilot. I guess I could be a commando while I/we wait to find out what an engineer is actually going to be doing(what exactly repairing ships would entail.) any and all help would be appreciated.
Like the others say its not a major issue. If you want to join the commandos great, I would be happy to have you as a squad mate. If you think the Battlefleet crew is more your role because of your engineering side then go for that role. You can always assist in defending the orgs ships and join in on FPS assaults with the commandos even as a member of the Battlefleet.
Either way you can change later as the game develops to what you think is best!
Really depends on the type of engineer you'd like to be. From what I've seen, there's going to be gear for offensive hacking as part of a boarding party, ship repair, etc. But we're here to have fun and sometimes what is fun changes.
You will have to send Lexer a PM. just give him a heads up you would like to join the battlefleet as an engineer and you will probably be put into the "crew pool". If you are interested you can decide to join the Childress AFAIK you have to do that via Lexer too.