Regardless of what type of foot strike you have a dynamic warm up that focuses on rhythmic motion through range is a very good idea. Best done on a flat grassy area. You can do the following things for about 50 to 100 feet each:

Heel walk with knee locked, ball of foot is lifted and curl toes if you can
Toe walk with knees locked
Straight march - lift the knee high and grab the shin gently pulling to chest, try to land on the foot the way you would running and also try to push off the toe in the same way.
Leg cradle march - as above except that you rotate the foot toward the opposite hip turning the thigh and knee outward
Quad pull - walk like the march but instead of pulling the leg to the front you grab onto the ankle and do a motion akin to a quad stretch.
Walking lunges
Skipping - first small and quick then bounding forwards
Sideways running - aka Karaoke

All together this takes about 5 minutes.

Please note that this is not my stuff, I got this from the running course I took with Matt Walsh. I just wanted to give credit where credit was due.