I have got myself a new bike today, which I love! It's the first bike ive had in years, and it's so much more easy to ride than bikes I've had in the past...but as I'm a total novice, I don't really get how the gears work. they are the type that roll round on the handle bar grip things, and on the right are one to six, which i can change up and down and I understand those. But on the other are 1....2....3....etc. and I don't know what these are or how to use them!! Please someone who understands these things advise me!!?? I am braving first bike plus trailer school run tomorrow, eeek!