It’s not LED, but 2 x 315 CMH units over a 2x4 would give you tons of light and produce plentiful yields of dense, smelly flowers. You could do 1 x 315 CMH over a 2x3 area to start with if cost is a concern. This hobby tends to pay for itself vs any other hobby, so don’t cheap out if you can help it. High quality LED seems to cost as much as the entry level CMH and I know for a fact CMH grows fantastic bud.
There’s literally a million options for seeds to start with; no such thing as one best strain. Are you in the USA? So many great seed bank options. Canada has plenty, Europe has plenty. I’d be happy to recommend seedbanks with high-quality inexpensive seeds.