The Mission Rules.

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The missions offered by the Rogues guild are to be carried out in two-man teams. The risk is always high, and failure will result in monetary punishments or even death. If someone is unable to pay their fine in cash, they'll always pay it in blood. Completing a mission successfully however, will also yield large amounts of cash, or other items that will have significant value.
The two-man team can be formed with anyone else interested in the Rogues affairs, and they will send you to missions all across the world. In case noone else is available, you can request a GM to roleplay a Bounty-Hunter of moderate skill (B-rank) to assist you on the mission. This will, however, reduce the amount you'll earn, compared to pairing up with another PC.

Missions accepted from the Rogues Guild will often times be against other player-characters in inter-active missions. The bounty on your head will increase, just by accepting the missions.

You can find and accept missions Here.