I order 500 crickets at a time (there are a lot of good cricket suppliers online, and they are all about the same price).
They are easy to keep at this number. I have a 10 gallon tank with a screen top. I line the bottom with paper towels and tape them down with masking tape (this is worth the trouble for cleaning purposes). I change the towels every new shipment. Inside the tank, I keep the egg crates that come with the crickets, along with paper towel/toilet paper rolls for furniture. Keep plenty of this kind of furniture so that every cricket has elbow room; this will cut down on cannibalism.
Most cricket suppliers sell water crystals. Get some of these and put the
hydrated crystals in a small dish in the bottom of the tank. This will keep them
hydrated. I change them every other day (some people keep them for longer with different feeders, but crickets are gross!), and I stir them on the day that I don't change them. I feed my crix a small dish of commercial cricket food that I got from my cricket supplier, and I also throw bearded dragon pellets in there; the crickets LOVE the pellets. I also keep a small paper plate of greens, the same ones that you feed your beardie. You can use potatoes for food and water in the same source, but the cost adds up and they are gross. There is nothing like a hollowed-out, dry potato full of tiny crix
Every day that I get crickets out, I also clean up dead crickets, cricket shells (they molt or something) and cricket poo. I use a paint brush now (stolen idea from someone else on this forum). I use it like a broom and sweep all the waste into a corner and use a small paper plate torn in half as a make-shift dust pan. I like the paint brush because it's gentle if you hit a cricket (which most will move out of your way) and it fits into the tank.
If you keep the crickets clean on a regular basis, the smell is minimal at its worst. I would never consider breeding crickets as they are nasty little critters. I don't suppose it would be hard, but its just not worth it to me. I can get crickets delivered directly to my door for about $20 per 500 (and really, $20 for 1,000), so that is reasonable enough for me. One of these days, when I can afford my dubias, I will never have to mess with the nasty little bugger ever again!
But seriously, save some serious cash and order them online in bulk.