I can give you a few suggestions, but I really don't know what you're working with as far as musicians. The jazz/swing band I play with has 10 members; drums, bass guitar, keyboard, guitar, 3 saxophones; one who also plays flute, a valve trombone, 2 trumpets; one of whom also plays Baritone horn. It's a pretty good mix. They're all experienced musicians. The guitar player sings and has all the Brian Setzer riffs down perfectly! He's in his mid 40's. The bass player is about my age, the drummer is in his 50's, and the horn players range in age from 27-71! There's a lot of diversity, which is great! All the members are great showmen

Think about why you want to have a band. Find people with the same goals. As far as a playlist, play what you like and don't be afraid to write. I think you'll find that the group takes on a whole new attitude when you play your own music. To start pick a tune you like and try to write a tune like it. Same feel and form. This will help you get over the difficulties starting.