Regular veiltails from the shop are fine, but veiltails are not as popular as other tails like halfmoons etc. make sure you ask local petshops before you breed to see if they would buy them from you.
They site for the microworms is correct, thats all the info. You need on microworm culturing.
I use brine shrimp and microworm, microworm is easier, brine shrimp helps them grow faster....