It all depends how big a garden you want to plant. It's quit a bit of work so you need to plan your time around keeping it up.Here's a few tips:
Plow your garden in the fall, so all the grass will be rotted and you will have fewer weeds, plus it enriches the soil.
Have enough tools and equipment to keep your garden growing and clean.
The best thing to do is determine how big your garden spot will be. Decide what you are going to plant, then go to a garden shop and price out the things you will need.i.e plants, fertilizer,equipment, The people work there can give that information. Fruits grow on trees and vines.so they take longer to make fruit. Tomatoes plants should set 3ft.apart, cucumber plants about 4 foot apart, onions-if you get onion slips or bulbs, put them about 6 inches apart.etc.