Old Perfecto Hood,
Hagen Aqua-Glo 15watt,
Read forums, read articles, read read read. Then when you've gotten sick of reading, talk to whoever you can that has ever kept fish.
Danios (all kinds),
Brazilian Swords (mine do fine submerged),
Mondo Grass (mine does fine submerged),
The first shall be last and the last shall be first
Just got into the hobby.
When you see signs of stress in your fish, you can then take steps to identify the source of that stress and then to resolve it before it becomes a major issue.
If you're looking for a unique way to stock your new tank, give freshwater shrimp a try.
If your fish is suffering, you may want to consider euthanasia as an option to humanely end his pain.