like all kits, he turns six moons old, and has his ceremony.
He becomes a warrior after the battle over sunningrocks in a dangerous path. Bluestar at the time had doubt in StarClan and when she sees that Cloudtail doesn't believe in them she makes him a warrior but not any other apprentice.
the answer is the kit has to be 6 moons in order to become an apprentice
An apprentice becomes a journeyman, and a journeyman becomes a master.
You would become an apprentice
For a kit to become an apprentice they have to be at least 6 moons or 6 months old.
Cloudtail (cloudkit/paw)
Fireheart's sister Princess, offered one of her kits to him so that it could train to become a warrior. Fireheart ended up bringing Cloudkit (Later Cloudtail) into the clan :)
The usual step between apprentice and Master is called "journeyman".
6 moons.
As there were no art schools in those days, becoming an apprentice to a skilled artist was the only way to become an artist. This was what all aspiring young artists did.
He was Darth Sideous' apprentice.
being a good person