SUPER easy to mealworm farm.
I find it easiest to do drawers. I know a lot of people that don’t separate their stages but I do. I find I get a better turn out because the beetles aren’t eating the larvae/eggs.
I’ve got thousands of worms. I started last April so it’s almost been a year. 
The best bedding I would suggest is something small so they can eat it faster. The worms grow really well on wheat bran. I get a 50lb bag at my feed store for less than $15.
make sure to microwave or bake it to kill extra bugs! Grain Mites are a HASSLE but they only come around when the humidity Is too high. So make sure whatever water source you add to your drawers they eat right away.
I would stay away from apples and potatoes. They tend to smell and mold if forgotten about. 
My farm goes crazy for aloe, cactus, carrots, lettuce, cucumber, etc. 
Anything with a high moisture content make sure to watch and don’t add it straight to the bedding cause then it could mold. I add a piece of cardboard and then put the water source on top and they will crawl to it.
I almost always just use carrots. They’re easy and cheap.
Make sure you’re watching if they’ve been sprayed with pesticides though and wash thoroughly because that can kill your whole farm. 
I leave my beetles in the bedding about 2-4 weeks. After that I remove them to new bedding and leave the “old” where all the eggs are to sit. I can usually see babies immediately. 
the warmer it is where your farm is, the faster you’ll see worms. 
I keep my room about 70°ish so I see worms relatively quickly. 
Mealworm farming is pretty interesting and cost me... 

 maybe $6to start. I haven’t had to buy anything again other than the occasional bag of carrots.
$30- 10 drawer craft drawer system (
Walmart)
$15 - wheat bran (still have a ton! I just had to repackage it in sealed bags)
$5 - carrots 
$15 - mealworms 
I personally sell kits for mealworm farms and it get you a jump on farming. I give you all the cycles. 
beetles, eggs in the bedding and jar, worms and pupae.
if you have any questions I would love to answer them! Farming mealworms is a fun and interesting process!