Going to start my first grow soon I have some questions naturally

Well I plan on buying the auto easy rider seeds feminized. The light I plan on using is the 2ft 4 bulb t5 new wave fixture with a mix of 6500 and 3000. This would be a total of 96 watts my first question is how many autoflowers do you think this light could support I'm confident it will grow one but I'm not sure if I should get an extra light to grow another. I want to grow 2 plants at once and I know the rule of thumb is 100w per plant and an additional 50 for every other plant. I'm thinking though that given these are autoflowers and will only grow small that the light i have will be enough. some insight would be greatly appreciated thanks

in the beginning stages those 2 lights should suffice if there close enough to the plants, but by the time you flower you should look into at least a 100w MH

will the 100w mh need air circulation?