I would look at this as a choice funnel.
1) How much weed do you need? A) About 400-500g per harvest (from earlier)
2) How much space will you use? Based on the above, 3x3-4x4 would be good. Current tent bit too small no matter what you do.
3) What strain will you pick? Auto vs Photo.
Sativa vs Indica. Makes a difference.
4) What light will you pick? Should be the biggest budget impact. Spend more to get more. What you choose impacts ventilation and height requirements.
5) What will you grow in? Hydro (DWC, RDWC, Ebb & Flow, etc..) Soil (organic vs not organic) Other (Coco Coir, etc..). This is a complicated choice. In practical terms, each one is its own different thing, which limits how much people can help you who do not have experience in that same medium. Probably warrants the most discussion.
6) How will you control the environment? Temp, humidity, air circulation, noise, smell etc.. Lots of gadgets for all this. Product recommendations can help.
7) What will you feed it?
I think that about sorts it out. Hope this can help you focus your questions.