My personal check list for starting a new bar band that plays covers for cash-
Find guys I like that are already pro players.
Find guys that like the same kinds of music I do, so that we already know 50-100 of the same songs.
Find guys who have great ears and understand music, so that I can call whatever tune I get a request for if I know it, and the rest of the guys can get through it competently whether they know it or not.
Make a song list and share it with the other members. (maybe)
Don't hire anybody who doesn't have reliable pro gear.
Get every member's email address and/or cell number, so that if we get hired someplace and a certain song is heavily suggested, I can let them know a day or so before the gig, so everybody can come in ready to play it.
Go book gigs.
Go play them.
What is this "rehearsal" of which you speak?
My checklist for starting a new original music project from scratch-
Find guys I like, who play the instruments I need in the band.
Make sure everybody is competent and picks things up quickly.
Make sure everybody has working gear, and is willing to get better stuff if they need it.
Make sure everybody knows to bring their own beer.
Make a record.
Gig to support and promote it.
Sell a bunch of copies.
Deal with the fact that yeah, it's seriously incvonvenient, but you have to rehearse and put in extra work because it's original music that hasn't been written yet. At least it's fun to get together, and you get to slam and deride all of the crap songs you all have to play in your cover bands, so you have something to laugh at together.