You'll be fine....
If you have newly (as in just now) hatched artemia, they will take that - put loads in, and keep an apple snail with them. He will eat any left over shrimp. Paraomecium are only needed for the really small nothos (janpapi etc)
Then in 3 days or so, the fry will be big enough for grindal worms
Growth is rapid - they eat a lot - you want to see big fat bulging pink bellies
Separate any that get too big too quick to avoid canibalism
If you have mastered artemia, you are half way there