I raised the first batch my clowns laid and It was a super rewarding experience but very time consuming and stressful lol.
They only had 30 somthing eggs hatch the first time which really helped out because I don't think I would have had enough rotifers for hundreds.
Do as much research as you can and make a plan, don't let people discourage you eaither about your first time I only lost a couple out of all the fry I was able to catch.
The first thing to do asap before anything now if you want to raise them is get rotifers growing so you don't run out.
Mine were eating the smallest tdo within the first couple days but the rotifers were stimulating that feeding response I believe.
I wouldn't count on being able to buy the amount you'll need even if they're locally available.