Reddit reviews Grow Great Grub: Organic Food from Small Spaces

https://extension.umd.edu/hgic

Consider signing up for gardening classes, lectures, and seminars. Try your local extension service, garden clubs, botanical gardens, and plant nurseries. Youtube has a wealth of information, but it may not apply to where you are. There's a regional aspect to growing.

Start gardening where you are right now. Skip trying to start things from seeds (it's July), and just see if you can keep some herbs alive in pots for now, like basil or mint. Learn to cook from scratch and how to can/preserve/ferment your food. Reddit, youtube, and the internet in general is full of countless resources on this and other related topics, everything from r/gifrecipes to r/cooking to /r/EatCheapAndHealthy/ to r/baking to r/homebrewing - and of course there's tons of garden-related subreddits.

Buying your actual piece of land is step #4209 of homesteading, not #1. Without experience, you'll have no way of evaluating whether the land actually fits what you want to do or not.

Here's two books to consider, to help you learn how to garden where you are currently -

https://www.amazon.com/Grow-Great-Grub-Organic-Food-from-Small-Spaces/dp/0307452018/ref=cm_cr_dp_d_rvw_txt?ie=UTF8

https://www.amazon.com/The-Urban-Homestead-Expanded-Revised-Edition-Your-Guide-to-Self-Sufficient-Living-in-the-Heart-of-the-City-Process-Self-reliance-Series/dp/1934170100/ref=cm_cr_dp_d_rvw_txt?ie=UTF8