Help! Leg shaving! Need tips and help!?

Hi, I am 13 years old and just started shaving my legs. I am doing it in secret, I didn't tell my mom but I think she knows anyway. Since it's summer I have been shaving all my leg till my thigh, how often should I shave? What are some tips on making it grow back less thick? Since I have blonde hair I have had a lot of leg hair since I was little but it was relatively transparent so you didn't notice it. My sister started shaving at 12 and my leg hair was bugging me so I started shaving. Can you give me some tips? A little help?