Ok. So, the game just started. For the most part, the only thing any player knows is what their own role is, and which alignment they are. You should have checked your PMs to see that info. Everyone who is playing belongs to one of four possible alignments, Town (Good guys), Mafia (Bad guys), Third Party (Alternate Bad Guys who hate everyone), or Neutral (Matters to nobody). If you aren't Town, you have say which alignment you are immediately.
Right now we're in Day 1. At this point we have to decide which player we want to remove from the game (called a lynch). We vote on this, and "No Lynch" is a possible option. If you are Town, you are looking to lynch Mafia or Third Party. If you are Mafia, you want to lynch Town or Third Party. If you are Neutral, you just want to stay alive.
If you want to vote for a player, post
##vote <player name or no lynch>
If your role has a day action, you may consider using it during this phase, but beware, day actions are usually limited is uses, so check your role PM for details. How you use any action should be detailed in your PM.