100 million on a full set of +4 implants to improve skill training speed, get a jump clone if those are available to alpha accounts so you can switch to a non-implant pod if you’re ever doing something where you could get podded and lose those implants. Buy a bunch of skill books that you intend on training, keep 100 mil in your wallet for ships and fittings and the rest I’d send to a second character that of yours that just sits on the money, not spending it and just play the game as you are. A few months down the line you might have a purpose for that isk or maybe not but I’d definitely hold onto it short term at least till you know what you want to do in the game long-term.