You can do it rather cheaply as I did when I first started to get the hang of it. First started with pop 2litres, then I saved our Orange Juice containers because they were a great fit and size with easy to drill lids (Tropicana 1.6qt). I drilled the top of some for the rigid air tubing.
I began with only two bottles running.
1.Simply put them on a shelf with an air pump with tubing to the rigid tubing , through the holes in the top to keep the cultures at a good bubble.
2.Now the light I use is a simple daylight bulb from around the house (you can get at any store). I think mine are 60W. I put the light between the cultures to get light around the bottles. I have not needed mirrors yet, but may do on my newer set up.
3. Get the cultures you want. I currently use both Nanpchloropsus and Tetraselmis. When I first started I only used Nano. I got mine from here:
http://floridaaquafarms.com
4. Follow the directions on how to get the cultures out and type of water to have. I used tap water for years with my old cultures, but currently am using my RO. I keep the specific gravity around 1.020 or so.
I do not heat the cultures and never felt the need to worry one way or the other. They are located in my basement in the fish room that gets pretty hot in summer with the chiller running, bun not too cold in the winter.
I use a food that is pictured below. It also comes from same place as cultures.