Allow me to use this holiday to take a slightly contrary viewpoint...
Pedro, just go and do what you and your band does and let the soundman worry about relaying it to the house. Don't do anything you wouldn't ordinarily do. Set up close to each other if you want everyone to hear you. Your sound will get out there. A 60w amp isn't loud but it isn't quiet, either, especially when being pumped through subs. With separate monitor mixes + subs, your band should be able to hear you fine.
Pedro, just go and do what you and your band does and let the soundman worry about relaying it to the house. Don't do anything you wouldn't ordinarily do. Set up close to each other if you want everyone to hear you. Your sound will get out there. A 60w amp isn't loud but it isn't quiet, either, especially when being pumped through subs. With separate monitor mixes + subs, your band should be able to hear you fine.

