Welcome Lolli from Lollipop!!
I too make dance costumes and I'm sure you have found that once the Mums find out you make costumes you are inundated with requests. I have had to be very strict with myself as I find it so hard to say no and until recently, have seriously undercharged.
Definitely have a go at tutus - they are seriously addictive! I would recommend a course but it is totally possible without. Shout out on here if you need a hand, there are a few of us on here.