Good that you read a lot, I've did that too before starting and I got great results.
The humidity you got there can really be a problem, at the veg part you should be all right but when flowering it's a nice invitation for mold. So you need to get ventilation there, personally I see no need for an active intake, you could only have an exhaust. Good idea to germinate some other seeds, don't forget you have 50% chances of each sex... You're getting on the right track, keep reading and keep us posted !