Thank you so much Johnny, Rex and Gabby, that is beyond helpful. I was thinking of starting with plates for my wall and then moving on to replacing all our boring white plates in the cupboard with more colourful ones. I live in the UK but usually we have very similar brands to the US so I'm sure I will find those here. Will do more research on that as my toddler will be eating off those plates too.
And Rex, those fish look amazing, I hope I will once get as good results as that.
I'm guessing I can mix underglazes too to create new colours?
Thank you so much!