Keeping a worm farm is an easy project
Worm castings -- AKA poop -- add valuable nutrients to the soil and is easy to make. The hardest part is making the bin and that's not difficult.
Tomatoes are the most commonly produced greenhouse vegetable crop. Although greenhouse promoters claim each plant can produce 30 or more pounds of marketable fruit per year, that level of production is only possible with very high inputs in quality facilities and optimal cultural practices. In western Oregon, it's more realistic to harvest 20–25 pounds per plant space each year.