I prefer to start them in smaller pots because the larger plants with larger soil volumes will result in saturated soils and chance of rot. Overpotted (too large pots) will result in tuber rot.

Choose pots which are not too small, though. In fact, try to get pots which will allow atleast 1" of space between the edge and the tuber. This will ensure good rooting.

The pots should have 1.5-2" of soil in the bottom. Plant sprout side up and cover with 1/2 to 1" of soil. Then water well once. Use a well draining medium, such as seed starting soil, or try potting soil mixed 50% / 50% with perlite (you can find these white puffy things in 4 qrt bags at the garden center).

If you do not have flourecent lights, then start them in a window which is facing east or north. Turn pots frequently to avoid plants growing towards the light. I used to use an eastern facing window with a white sheer curtains to block the light in the morning. In the afternoon I removed the sheers for better light.

When transplanting, do so as the plant is 4-6" tall and can hold the root ball together.

65 deg F is just fine.

Tubers without sprouts, you can plant as usual, but do not cover. leave them in the pot and as soon as they sprout, cover with 1 - 1.5" of soil.

Try this link for a picture-by-picture guide for how to start tubers: Guide

Here are some pictures:

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Here is a link that might be useful: Tubers picture guide