Lily bulbs do not like to dry out too much, so the sooner you plant them the better. It is a bit cold for putting directly in the soil, so you would be better putting them in pots fro the moment. They do not need frost. The are hardy so once the soil has warmed up you can plant them in their final position.

So your main concern right now, Train, is to pot them up, and keep the pots they are in from freezing. The warmer temperatures indoors will start them too early, making problems with light indoors, and hardening off later. A cool conservatory, unheated but frost free greenhouse, or similar garage are your best bets right now.

They like to be planted rather deeper than you would expect too.

Yes, unlike most bulbs, only a few roots come out of the bottom of the bulb--the rest grow along the stem as it approaches the surface.