Most machines come with a free motion foot. It's called a darning foot and has a small presser foot with a spring on it. Look around in your attachment box.

You don't say what your appliqué is so I don't know how helpful this will be. If it is flowers, for example, then you can simply put a couple of decorative stitches in their centre. For leaves you could stitch some 'leaf art' i.e. stitch some lines so it looks like veins on the leaf. For animals, fur, etc.
Alternatively, if the quilt is not going to washed a lot, you could stitch round the outline of the appliqué with invisible thread (it can go brittle if washed frequently). Good luck whatever you decide.

Maggie May has a good idea for you to do. Good luck and get those pictures in, the board will help you with pictures.

I am in awe that you did a king-sized quilt for your first machine quilting experiment! You go girl!! I would love to see the quilt - can you take digital pictures? If you can I'm sure we could walk you through posting - I am definitely NOT a computer whiz, so I know you can post pics with little prior experience.

As to quilting it - I think I would go with bearisgray's handquilting around the appliques idea, if it was me. I do like Knitette's idea of the little quilted accents in the appliques...but then you have to stuff it into the machine again. (Good upper body workout, though.)

Good luck!

Alison