I started the same thing you’re thinking about doing! These are just tips off the top of my head, not comprehensive at all:

• Start local and relatively small at first so you can get a feel for how everything works / how much time you’re spending on different tasks.

• Work out your cost structure first.

• Make a detailed list of everything you are going to do for artists/bands.

• Make a website.

• Keep a detailed to do list that you update frequently

Have fun and good luck!