Dave, I'm only a few years younger, and use an S-950. Though I recently retired due to health issues, the best advice I have is to first purchase a high quality mic, one that will make your vocalist sound very, very professional. This is a very important ingredient. I suggest a Samson Q8, which is very easy to work with and responds well to both male and female voices.
Then, go into the mic settings and set the effects parameters to where that person sounds best, which pretty much eliminates the default echo effect. Just add a hint of reverb, set the EQ according to his or her voice, and save the information into a setup registration.
The next step would be to utilize either the Music Finder Directory (MFD) or registrations to set up a song list and all the settings association with each of those songs. There are lessons on the forum that will greatly assist you in this step of the process.
The final step involves practice, practice, practice, which is the most important. Do this with your vocalist and go through each and every song until it becomes second nature and that you both can communicate during each performance to eliminate dead time between songs.
That's the best advice I can offer from more than 55 years on stage,
Gary