I do Avon and have just got a starter kit from Usborne. I also write freelance and get the occasional (like once every 3 months) call to go and help out for a few days at a publishing company that I normally write articles and reviews for. I also have a market stall selling t-shirts, books, badges, and I have recently passed a training course to be a Humanist Wedding Celebrant.
If you are going to work for yourself, look into tax credits (if you're not already getting them) and help with childcare costs. You will probably find you have to do more than one thing to survive, the direct-selling stuff is OK if you go with a reputable company but it does depend a bit on there not being too many other people working for the same company close to you. The really good ones assign you territory if you're going to sell door-to-door but if you plan to sell at, say M&T group or to your mates and half of them are already doing the books/homewares/cosmetics as it is, you'll find it harder.