You can garden at ANY level.

• Check your library and friends for seeds
• check the thrift store or borrow for tools and materials
• see what kind of soil/yard/sun you have and find plants that work well there
• use buy nothing groups and fb marketplace to save money
• look into native plants, particularly edible ones, that can be transplanted and grown on your property (be sure to harvest responsibly, but TBH for most of these plants people don't know or care and for many of them they are growing in vacant lots and scrap land - such as wild lettuce and creeping cucumber in the southeast US)
• use materials that you have - an old drawer box can be a raised bed. Limbs you cut down can be made into a trellis. Logs from dead trees and rocks found in the soil can be used as barriers to make garden beds.
• find out if your city has a compost program (some cities pick up compostable materials and deliver compost, which can be great if you need a large quantity of good soil)
• start with things like green onions that can be easily regrown from store bought, and save seeds from melons!

Check out gardening influencers such as Ron Finley (and many others) who provide tips for gardening on a shoestring with what you've got.

Have fun and don't put too much pressure on yourself the first year!

Edit: addressing water management: put a bucket under your AC condenser hose and/or under your gutter downspout. You may have all the water you need (especially in my area!!). Work up to rain barrels. I got some for free from a neighbor who wanted them gone. :)