You shouldn't need a full PA setup at that size, we play pubs and rarely have to put anything other than the drums & vocals through the PA. Our PA mixer is a Yamaha 600watt with JBL speakers and subs, the amp model is
similar to this one and is nice and compact for gigging.
We have a set of drum mics, we do mic the kit up, but we find its mainly only useful for the bass drum.
With 4 singers you'll obviously need 4 boom mic stands. We only have two singers, so we have one wedge monitor at front of stage, you may need two. We have a separate small crate pre amp for the monitor, but I'll admit, I don't know how all that works. We use
shure SM58 mics, superb all round mic for this type of environment.
To follow this kind of set up, your Guitarists will need at least 100watt amps for the backline. I use a 150watt Combo amp, the other guitarist has something similar and our bassist has a nice big Ashdown stack.
And some other stuff you may forget but are really useful:
- Leads, lots of quality leads, never a bad thing to have spares, you will need them at some point.
- Guitar stands, nothing worse than faffing with cases while not on stage
- Lighting, you can get some nice compact coloured gel lighting rigs perfect for adding ambiance on stage
- Kit bags, bags / tubs for leads, drums, general stuff makes things tidy, easier to store and transport
- A transit van
I'm not sure how much kit you all have at the moment, but I'd recommend as a starting point pooling together everything you all own and see how close to a gig set up you already have. Its amazing how much stuff a musician can amass over time