Hi Rockthis,
The Equipment List suggests fine sand to the depth of 1 inch - that's a good recommendation for a bimac.
It's best to bring the temperature down to at least the lower seventies. You usually don't need a heater with a bimac, but may have to cool down the tank in the summer, with a fan or chiller or other method.
Some of this will depend on where you live, how much you air condition your home, and so forth.
Nancy