- Read the manual.
The church has gone to great effort to write a manual to help administrate in any calling. Ask the Primary President for a copy of the pages which define the your duties. This then provides a helpful outline of how best to fulfill your calling.
- Meet with the Primary Presidency
It is always helpful to meet with your leadership to get their perspective on your calling. You are to work under their direction, in addition to seeking inspiration on how best to fulfill your calling. Your Primary Presidency perhaps will have helpful suggestions on what they see helps the children most during singing time.
- Understand the schedule.
Nothing is more frustrating than to be on a "team" that ignores each other's needs. Make sure that you understand when you are to start "singing time" with the children and when you are to stop. It is important that you are considerate within that time frame, so that the other responsibilities and activities planned by the other Primary workers also have the necessary time they need.
- Rely on the resources provided by the church.
True, there are many, many resources available online or at your local LDS bookstore. But oftentimes, these are not always needed. Don't get blinded by the "cutesy" offerings, thus forgetting the Spirit. Your two most important materials are the actual songbook and the church manual which outlines your calling. Prayer is powerful when you use it to benefit your calling. You have every right to be inspired and come up with activities on your own. Don't think just because a game or visual aid is "published" that it is better than yours.
- Attend inservices.
You might be surprised just how much you reap when you "sow" the seed of obedience. Attend the trainings and inservices offered you in the ward and in the stake. My background is in human resource development and in developing training programs. I have had a fair amount of training on how to teach. Yet even still, I am richly rewarded when I attend inservice meetings for my various callings. The Spirit can teach so much when we are where we are supposed to be!
Here is a link to help.
All my best. And remember, D&C 111:11!