First Time Grower: Ventilation Concerns

I am researching for my first ever grow and am very concerned as to how I am going to ventilate my grow space. I will be growing in my closet and can't come up with a way to place a venting tube. I'm thinking I could keep the closet door open and place mylar all around the space, hanging it from the ceiling to conceal the space and block where the door would be. I'm also thinking of placing a beaded curtain to further conceal it. Concealing it shouldn't be the issue because no one will see the space except me. Then maybe placing a clothes dryer tube under the mylar and run it out of the closet? I will place a fan by my lights blowing down, another at the base blowing up, and one last fan circulating air by the base. This is only my first idea, and a rough one at that. Otherwise, would it better to leave the door on. I should add that my space is small and I only want to grow a few plants at a time. Would opening the door each day create enough ventilation? The outside room where the closet is located will be heavily temperature controlled with virtually no sunlight reaching the inside of the room. A barn fan will be circulating the air in the outside room as well. I believe that I have almost every other aspect handled. With some more research, I should be fine, I just can't find an adequate source on how to properly ventilate my space. Any pointers or concerns would be greatly appreciated. I could use any help you have to offer, not only on ventilation techniques, but on general issues I should know about.

Thanks everyone.

p.s. My closet is located directly adjacent to a door that leads to my patio outside. It is too far from the window to run any type of ventilation system through. Again, hopefully because I only intend on keeping my operation small, that will not be an issue.