First off how big is he? You said you have a 'large tank' ready. In the case of ball pythons, smaller is often better, as a larger cage can feel insecure and stress them out since they are so shy. Put lots of hides in it if it's a big tank. Remember even an adult female ball only needs a 30 gallon sized tank.

Bed-a-beast is fine.

Keep the humidity in the 50-60% range, you may need to mist the tank periodically to keep it in that range. Use a digital thermometer/hygrometer to measure your temps and humidity. Ball pythons do not need a soaking pool.

Wait a week before offering food. Don't handle until after the snake has eaten. Always wait 2 days after feeding before you handle to prevent regurgitation.

Yes, it's good that he seems relaxed. You may want to consider scheduling an appointment with a reptile vet to make sure there aren't any parasites, or other health problems. Here's a link to a reptile vet directory: http://www.arav.org/Directory.htm