I borrowed a dehydrator from a friend and it had an on/off switch and that was it. I had no idea how warm the thing got or anything. I tried dehydrating a few different things with it but the results always varied and sometimes cooked/burned more than dehydrated. So I would definitely recommend one with adjustable temperatures.
One temp definitely doesn't fit all purposes. I ended up getting a Nesco off Amazon. I got this one. It's a little pricy than a thrifted one but I haven't regretted it and have made perfectly dehydrated mushrooms, fruit leather, and herbs. I still want to try an onion (outdoors!) and jerky.
We were having trouble with a pesky squirrel but our strawberries were still blooming and we wanted to let the bees still get in so my husband wrapped it around and it was enough to deter the squirrel. Here link to the bird netting we used:
Garden Netting Gobetter, Bird... https://www.amazon.com/dp/B099WB2QH6?ref=ppx_pop_mob_ap_share
It is not my site, but it looks like a great one for DIY hydroponics growers. The free book list consist of links to a wonderful old series of now out of print garden books. The Field and Garden Vegetables of America Containing Full Descriptions of Nearly Eleven Hundred Species and Varietes; With Directions for Propagation,Culture and Use is one of them.
Depending on your location and situation, different books might be more helpful than others.
I assume you are wanting to start homesteading because you are trying to be more self-sufficient, even if it means just growing one thing you use to buy.
If you are fortunate enough to own land, there is essentially only one book I can recommend (owning it myself)
If you don't want to be a real prepper, ie. go completely off-grid
Also, @StolidSentinel 's list is a very good start. Even if you rent you can still grow food.
There a million other books out there, but these ones should provide you with enough knowledge to hopefully make a success of your homesteading dreams.