We can help you with all of that here. It might seem overwhelming at first but once you get the parts in hand it is honestly very simple. Building it at least. All the math I still struggle with but I know everything is golden from everyone's help.
I got a 400w light built for $700, that includes shipping too, and expecting 1gpw at least on this new system. Doubling my yield and decreasing my electric use in half. Only requires a simple box fan to keep the lights cool, which was already in the grow area for air circulation. No ventilation and heat to deal with. Well there is heat, just not near as much.
It's worth it