Hi Bacms! Welcome aboard:-)
The Jewel 180 is a nice looking tank. You scored! You will need Co2 for a "planted tank", though you can also just have low-light plants and not worry about jumping into Co2 just yet.
If you are going "high-light/Co2" the DIY systems you're referring to, it probably won't be enough for the size of your tank. Generally they are used for tanks up to about 20 gallons +/-. Better off going with the "Complete Paintball Aquarium Co2 System" from Co2art.
You will want to stock the tank w/ a high biomass of plants right from the start to combat algae. It is a fine balance in a high-light tank between 3 factors: light, ferts & Co2.
Substrate is whatever you prefer, not sure what you currently have, but i'm not a fan of mixing them. Look up Estimative Index (EI) dosing for your plants needs. It is an easy concept and pretty straight-forward.
As far as lights go, I'd get some LED's...lots for you to research:-)
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