Definitely sound advice, I have many of them as they fascinate me. Lots of different colours, and sizes and varieties, I started off with a basic house leek ones, so beware, they creep up on you, but they are so easy.
Just remember the 50/50 grit and soil and put the grit on as a top layer to keep them off the soil and don't let them get waterlogged. You can also start them off with just a leaf peeled off its mother and popped a little way into the gritty soil. Good luck. Mrs Bouquet