For indoor growers, you will need to choose a specific type of light. Growers use CFLs, LEDs, MH lamps, HPS lights, and more.
CFLs are most commonly used by beginners since they are so inexpensive. If this is your first time, it might be a good choice.
LED lights are higher in power and higher in cost (significantly) but they require less electricity than MH or CPS. The latter cost less than LED upon purchase and highly powerful but require quite some more electricity. If you have a small grow setup, however, CFLs are likely the simplest choice for you.
If you feel like splurging on the very best, go for a smaller MH/HPS grow light instead.
Which growing medium to choose
Most beginner growers start with soil, since it is the easiest option out there for the inexperienced among us. If you want to try something besides soil, you can choose between perlite, coco coir, vermiculite, and more.
These are considered soilless mixes, which are a type of hydroponic growing, technically speaking. Hydroponics involves growing your marijuana plants directly in water, which can be a complicated system but a highly fruitful and rewarding one — it is said that the highest yields are achieved in hydroponics systems.
Of course, you can also go the organic growing route: composting your own soil. It takes more work but leads to great taste and yield results, plus it makes for a very wise choice for the environmentally minded.