I have done my first practicum in elementary school and the teacher was singing with grade 1 and 2 regularly. In fact, grade 1 students were learning only with songs. So every class students were taking their scrapbook, which included the songs and the activities related to them, and they were starting the class by going over the songs seen in previous classes (all of them or a couple if lots of things were planned for the class). This was the class routine and it is good because students are singing the songs very often so they remember it. There were also some gestures for every songs and I can tell you that kids really like to sing and dance.
After the routine is done, you can introduce a new song by first explaining the lyrics, showing illustrations related to the song, listen to it one time, and then introduce gestures. You can sing it again and then do an activity related to it, for example coloring the illustrations of the song. What's important is to play the song while they are coloring because it calms them down, they continue to sing and thus remember it, and they stay focused on the activity instead of talking with their peers.
I found a very good website for English songs. It gives ideas of gestures for a lots of songs and some of them can be seen on videos. You can also buy some CDs with many songs. The link is : http://www.supersimplesongs.com/
Have fun singing with your students!