Go with coco next time and try Cana A+B as it's very simple for a new grower. On this site you will find plenty of good info and pre-made cob/led units, Quantum boards seem to be the steady popular choice over the last few year. Looking at your space It would seem 400 total Watts of Quantum boards would suit you very well. Not sure on the prices these days, if it is too much then a single cheap open wing CMH will serve you well too. Get the 3k kalvin bulb as you can use that for both veg and flower.
A cheap 6 inch outlet fan on it's low setting should see you ok for the led fixtures in summer, high setting for the CMH. You don't need an intake fan. Get a half decent digital thermometer and put it under your plants in the shade. You want the temp at the root zone to be over 65 at all times, but try not to let them get over 75. With a cheap out-take fan you may have to manually turn the out-take off in the colder months to keep the roots warm enough. Cold/hot root temps are one of the most over looked aspects of growing.
If you have the cash you can invest in a thermostatic cut out switch, I highly recommend
THIS. If the temp at root zone drops below 70 it will turn the out take fan off and put the heater on, very simple yet effective, well worth the positives of plant health and saving on heating. If your growing area isn't enclosed try to do what you can to limit heat escape (buy a small tent tbh) as it will become a massive problem in winter. Theirs honestly no point having good lighting if you can't keep the environment in line. If money is an issue you'd be far better off with 200W of decent led, a small tent and the above.
Cana is one of those things, if you are going to do it you need to meet a certain standard to maintain plant health or it's kinda pointless otherwise.