Hi. Firstly where are you based? whats the band scene like round there?
Id say your much more geared towards solo artists / open mic nights at the moment if your going mobile, bands have such high expectation nowadays and you might struggle.
Im not up on PT, I use Studio One and their interfaces and Capture software is perfect for what you want to do on the fly.
If you want to record live rehearsals I think you will need more gear, but good luck with it anyway!