Be sure to save the first beads you made! String them together and keep them around so when you're feeling like your beads are garbage, you take a look at them and see how far you've come.
Speedslug mentioned it but I wanted to reiterate, different colors of glass flow at different rates, in my experience white is almost goopy while clear is one of the stiffest, and when mixing them together you can get frustrated if you don't take it into account and try finding a work around. All part of the obsession! ;D