ONI
(are you in the cosmo-rp discord group? Since it would be easier and faster to introduce you to the norms of rp.)
(Also, not critizizing though "several hundred planets" is a bit too big for a newer rp'er like you, a common number of systems is around 1-30, and i dont see several hundred planets as a managable or even likely number in that.)
(also, the reason for me suggesting to start off really low to probably what you want is that rp here is kinda a fun group thing, no-one is supposed to be "the best" and powerfantasy has no place here, so start low, expand as you go and get more knowledge and expirience, and please remember that change needs to happen from time to time, if your faction is wayyyyy to over-powered at your level it will come with bad rep and if you're willing to change, good. If not, well, no-one's gonna rp with you :/)
(shortly said, be willing to change and expect to start off weak since its then easier to manage and learn without coming with out-of-character consequences and in-characer consequences.) 🙂