I have been watching different clips on youtube and other sites on the internet and I would like to know if there is a difference between gumpaste, sugarpaste and flourpaste.

I believe sugarpaste and flowerpaste are the British terms for the American fondant and gumpaste, respectively.

i see it as it has already been said, sugarpaste is fondant, gumpaste is like modelling paste and flowerpaste is like modelling paste but more for flowers - also known as petal paste all of these have different ingredients or amount of ingredients ie sugarpaste or fondant has no gums at all as they are not needed, but both gumpaste and flower paste use gums (like gum trag or cmc/tylos) - they help make the paste dry out and hold its shape etct etc
hope that helps and didnt make you more confused!