getting an electrian to do is the safest. he has to be licensed, & he has to make your project comply with all the certification for national specs. anyway, if U do it yourself, U could get it going & then have an Electrician buddy look at it to ask his opinion. (that way he'll tell U the RIGHT way to do it, & not charge U for his opinion)
if U are in US, this must comply with US standards, if in UK, it must comply with UK standards. blah blah blah.
yes, U can have everything all in one room powered on the same circuit, BUT U have to make sure that the circuit involved can handle THAT load. (don't make all 3 electric clothes dryers in the same room turn on full blast all at the same time) U would also have to make sure the circuit breaker can handle that load. how are you power outlets arranged on your walls- U might have to cut thru the walls.
U can probably make the switch activate specific power outlets, & just plug in your operating light into those power outlets. i don't know the specifics on your lighting design so i can't advise U on specifics.
there are also some beginners books for electrian projects. but i don't have time to figure out all those.