I would recommend starting out in something other than coco for the first grow. Mix coco 50/50 with HP promix and lots of perlite. If you haven't bought your nutes yet, I would recommend you look at Tangs easy schedule using AN PH perfect Bloom A+B. Its actually pretty cheap and works great and is good for newbies.
While its inevitable that you'll have to learn my trial and error and dealing with issues that come up, I think starting out with coco only is going to increase risk of issues.
Also get a good PH pen and use it often. And calibrate it. Ontario RH and bottled nutes should not be an issue. Just keep the nutes cool and dark.
Also make sure your water source is ok and if not, get bottled RO water or equivalent.
