Our current team leader is quitting his job (starting his own company) and thus we are searching for a new team leader. It's a small team of 4 people (Team leader included). Since it's a small team we expect the team leader not to only manage us but also do some coding.
Because of this I convinced the R&D manager to let me have a say in this so that I can evaluate his technical skills and managing skills.

I have little experience interviewing people let alone my future Team leader. What I search in a team leader is someone who isn't running a dictatorship but someone that when there are issues there is a discussion about it and we take everyone on the same line.

What are the things I should not forget to ask and what are the skills I should find in that person?