The only way to truly know is to play a few session, possibly more if there are several people who havent played together before or the DM is fairly new, it can take a while for players to settle in. Also if the adventure you are playing has alot of investigation at the begining but most the combat later on you might have a wrong impression of the Dm's style after just two session.
Though if I had to ask a question or two before the game I think they would be:
What are you house rules? These can often be quite an insight into the DM's mind and the way he wants his game to progress.
Do you use Gather Information? This will most likely recieve one of 3 responses
'Sure'
'Its never really come up'
'I prefer players to roleplay through that kind of thing'
Each of which will let you know something about the style of play you might expect.
Should I write up a character background before I start to play the character? Will let you know if the game will be focusion on the campaign/adventures or on the goals and motives of the characters.
However no ammount of questions can compare to playing a few sessions.
Though if I had to ask a question or two before the game I think they would be:
What are you house rules? These can often be quite an insight into the DM's mind and the way he wants his game to progress.
Do you use Gather Information? This will most likely recieve one of 3 responses
'Sure'
'Its never really come up'
'I prefer players to roleplay through that kind of thing'
Each of which will let you know something about the style of play you might expect.
Should I write up a character background before I start to play the character? Will let you know if the game will be focusion on the campaign/adventures or on the goals and motives of the characters.
However no ammount of questions can compare to playing a few sessions.