Wow, by the looks of it you're using coco soil and not regular soil.
Coco soil is a nightmare to work with and I feel it really is only usable by experienced growers.
So the fist thing I would do is swap that around immediately.
Secondly, your lights.
You can get very good and cheap full spectrum LED lights off ebay or Amazon and team that up with a MH ligtt.
Your reflective material.
You can also buy proper reflective material off the same sites OR buy a small grow tent.
The yellowing in the leaves is nutrient issues, as they are not getting enough.
Get Cal/Mag and also some veg stage nutrients.
If you have any more issues just message me mate.