I would start a slow build of your systems as you can afford it. I would not start with fixtures or dimmers but with towers suitable for the venues the company uses. and with long 12/3 SO cable also suited for the venue (at least one for each tower). You do want to get quality equipment so it will serve you into the future. PAR56 will likely be the fixture to use. Lamp them at 300watts so you could power a tower of 4 fixtures from a single outlet/breaker. If you do want to go with LED units you really need to demo them before you buy, just to make sure that they will in fact suite your needs.