I am a first time "Best Man" and I really don't know what my responsibilities include. I'm looking for advice & suggestions.

 Some duties can include:

• Organizing bachelor party (or dinner, which is optional).
• Paying for your own wedding attire.
• Helping groom dress for the ceremony.
• Making sure the groom, groomsmen and ushers are at the ceremony on time & dressed properly.
• Driving groom to ceremony if need be.
• Presenting envelopes (from the groom) with fees/tips for people like the officiant (just before or after ceremony).
• Carrying the brides' ring down the isle and handing it to the officiant.
• Signing the marriage license, along with the maid of honor, as a legal witness.
• Giving the first toast to the couple at the reception and reading aloud any congratulatory telegrams.
• Dancing with the bride after the groom and fathers have danced with her.
• Driving the couple to the airport or hotel if they need a ride on the way to their honeymoon.
• Taking care of any tickets, keys, etc. the groom may need later.
• Organizing the return of all rented formal wear.