Most of the thousands of varieties can be grown from seed with moderate skill and reasonable growing facilities. The requirements for successful seed germination are light, warmth, moisture and soil. None of these necessary elements are difficult or expensive to provide. None of them can be ignored. A south facing window provides both light and warmth for a few seedlings.
Space is the limiting factor.
Light levels drop rapidly as you move away from the window and the proper amount of light is absolutely necessary. Proper light levels can be maintained by using electric lights. Fluorescent and high intensity discharge lights are the most widely used light sources. Fluorescent lights are recommended. They are inexpensive and effective for growing seedlings.