new room ventalation help

greetings, i am setting up a 2 srory barn to grow my tomatos, i ran th gas and electric and insulated the hell out of the barn with wall insulation and then stapled plastic on all exterior walls, got a used furnace that i am getting ready to install, divided first floor into 3 sections with 2 tarps [ one bud and 2nd pre-bud and veg ] third is just entrance and a space for furnace, whole 2nd story is mother and a feed room for veg, barn is roughly 30 feet by 20 feet, in bud room goal is 3 1000watt lights [ with 4 or 5 plants in pots per light with a traulluas] veg room goal is 3 600watt lights. upstairs, florances. problem is every day i have to use fans and the one window upstairs to recirculate the air with the entrance door. [very stale ] getting ready to install the duct work for furnace. would like to know best way to do this, using my furnace to recirulate the air, odor will be a problem, basicialy i have vapor sealed the barn with the plastic,this is my first grow and money is a issue for now, what is the best way to loose the odor once i start budding? also how do i create the positive air flow i need for cheap? thanks croweshead
 
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