Growing outdoors in Colorado?

Does anyone have experience dealing with an outdoor grow here in Colorado? I'm in the northern portion of the state, I'm sure that matters, I'm going to be constructing a 10ft×20ft×7.5ft tall hoop house to keep it legal and out of peering eyes, when should I be looking to get the plants in the greenhouse? I want to start them indoors first and early enough to get maximum potential out if each one (hoping to yield enough to not have to grow indoors anymore lol) so when should I get them started and how old/tall should they be by the time I have to put them in the Greenhouse? I'll be using clones, either buying a tray of 50 and weeding out the weaklings (only keeping maybe 12), or cutting my own but I'm appehensive since I've never done that before and have 0% experience with fresh cuts and don't want to fuck anything up, I also don't want to set any lights up in the greenhouse, that's an option right? They won't start to flower when I put them outside right? I'm wanting to use 6 mil plastic for the greenhouse but wanting to atleast double maybe even triple layer it to increase privacy, will that effect growth negativley? Will regular ol Wal-Mart box fans in a window above the doors on front and back be strong enough to ventilate the Greenhouse? Sorry about the "rapid fire" questions lol, this is about to happen for me and i waited too long to ask these questions. If any of these are "dumb" questions I apologize in advance, im just trying learn.

Green house or not ... The most important thing is to remember that if your plant is sexual mature, and you stick it outdoors too soon it will go into flower prematurely.
Make sure you really watch your light cycles indoors too before you put them out.
Best of luck to you and your grow.

The more plastic you put on your hoop, the less sunlight will get through. One layer of 6 mil is hard to see through.

Until the natural length of day gets past the flower point for your strains, you will need to insure the dark periods are not too long. This can be done by running a string of lights to extend the daylight hours into the safe zone,, or by running the lights for one hour at midnight.

The fans might work, but you will need to get temperature controlled switches. They kick in when it gets up to a certain temp.

Started mine indoors. Also in N Colorado. Excited for the 2018 season!
My biggest reccomendation is flowering time. It gets cold here early so it's best to have a quick flowering strain