I started with a 6ft whip, gotten off my senior trip to Disney world, from the Indiana Jones souvenir shop. It was surprisingly fairly well made for a theme park souvenir. Obviously not really high quality, but for a training whip, it served its purpose quite well. I learned on that, and beat it to hell. It unraveled and got repaired a bunch of times, until it really bit the bullet. It is now currently 3ft long, haha.
My best friend at the time had ordered a high quality 10ft leather whip then for my birthday. That is the current one I use. it was quite an adjustment, but I can use it fairly well now. It is much heavier, and harder to control than the 6ft whip. I haven't really brought it out for use since I moved to a more dense neighborhood area about a year ago though.