that should be plenty to start a small colony depending on how many animals you're feeding with them. Probably won't get any feedable crickets for 6 weeks or so I think.
you can start your colony with any amount of crickets but the less crickets you start with the longer it will take to build. Back when i was breeding crickets i purchased a box of 1k crickets and tossed half into a feeding bin and half into a breeding bin. The bin i used for breeding was a huge plastic tub with egg flats and a heat pad. no substrate and a tub of dirt for them to lay in. Every month i would swap the tub of dirt out with a fresh one and kept adding the dirt with eggs in it to a nursery tub where they would hatch and eat and grow.
kept the breeding tub between 80 to 90F and the nursery tub as close to 90F as possible ( not easy to achieve these temps in a temp controlled home )
Then as the crickets in the nursery grew up i would start a new nursery bin and that bin would become my new feeding bin. so its bascially all about cycling.
diet was carrots, greens, oranges, water gel sometimes. mostly i fed them in a dish carrots and greens lightly misted.
hope this helps.
fyi dubia is 10 times easier and takes much less energy and effort.