My husband bought me a EOS Rebel T3i 18-55mm IS II camera for Mother's day last year and I have no idea how to use it. I want to buy another lens before I take a photography class. Bestbuy has Canon 55-250mm f/4-5.6 Telephoto Zoom Lens and Canon - EF 75-300mm f/4-5.6 III Telephoto Zoom Lens. Any recommendations or advice would be greatly appreciated.