I always see other players creating new pets in projects.

it's simple but take time :

1. Make a design you like in the generator. If you plan on selling the offsprings making an interess post in the right forum could help greately.

2. Figure out what you will nead/start stockpiling. (usualy things like dyes, pies, essences and sometime philters.

3. clear some space. Some players use full on stables tho a tab is usualy enough.

4. generate / start breeding. This guide will explain this step more in dept.