Welcome!
Other people may have other opinions, but this is what I would do.
I would not use the revolver.
I would join USPSA & see if you get a Safariland Certificate. If so, I would buy a holster for the SR9 or FNX & use that for now.
I would buy some cheap Uncle Mike's mag pouches for double-stack mags.
I would load up your mags to full capacity, sign up in Limited shooting minor & shoot some matches very slowly & carefully.
After you see how things work I would then decide what division & gun you want to shoot in.
I would probably end up in Single Stack division with the SA Loaded 1911, but that is me.
Shooters Connection ships very quickly to Central Illinois.
I hope to see you at some of the matches around.
Hope this helps. Others may have different advice.
I would soak up all the good stuff in this forum, especially the 1st post in this this about your first match.
Dirk