Hey man, don't count me rude one. But to get started just read a little bit here (all the info is in front of you - perform a search using keywords), absorb some info and you can decide for yourself what is better for you in the matter of your current budget. Personally, for 4 plants I would go for 400W light. As for the fan, it depends on the size of your grow room (temp in the room should be 21-35 C). GL! imp: