Test your water with salifert test kits and with the heater just put it in the water, switch it on and turn the dial on the top to the number 25 would be most ideal and for cycling it shouldn't take too long just test for ammonia and nitrite and when they show clear you cab put fish and invertebrates in.

Just because the light that comes with it isn't for coral so you just won't be able to have coral but the filter just comes with a sponge so that can be used for saltwater and freshwater so don't worry, it can be easily used as a saltwater tank but with no coral.