When I have larger bins of feeders, I'll feed them fresh veggies, and the night before I take out what I will feed in the morning and place them in a separate container with their gut load.
Honestly there are probably as many techniques and routines as there are keepers. Lol. As for the insects themselves ... I think the biggest questions to ask your self...
How much space do you have? Can you keep a huge tub of 500 crickets, or have to stick with a shoe box sized container?
What feeders will you keep? This can often depend on where you live and the availability to you, although willing to buy online will broaden your options.
Once you know what and how much you can keep at once, and if you want to breed them or just keep them in supply... atart searching the forums for husbandry ideas, like the best way to set up a 500 cricket bin
Lastly, there will be some insects you buy and feed off pretty quick. Like hornworms, they can grow VERY fast, so they are not gonna be bought in bulk