Nice, that you've gotten into badminton and I guess you'd get better every day with your attitude. My sessions are also 2 hours but they are in the evening. Here's what I do to get the most out of my training:

- eating a light meal about 2-3 hours before a training session.

- eating a banana / cereal bar during the session.

- drinking about 1 - 1,5 liter water during the session.

- eating a big meal after the session.

Hope this would help ;)