Wait a little for signs of shoots and plant the shoots facing up. Or the shoot side is usually a little hollow and the root side rounded and may have a few bits of dried root left.

Indeed!

Best way to start them is soak in lukewarm water for a few hours then place the tubers into a polythene bag with a mixture of dampened perlite and compost 50/50. Put in an airing cupboard and once new growth starts after 4-5 days, carefully inspect to see where the bud starts before potting up.