Earlier he asked what I want to do to him when he gets home but I was completely speechless. I want to because I'm sure I feel the same way he does, I just have no idea what to say. Any suggestions would be so helpful.

Tell him what you want to do to him when he gets home - it's as simple (or complicated) as that. I've never been "much" for phone sex - never did anything for me.

I'd get as graphic as you can, comfortably.

Have you tried the AMHD search option? There was a similar question not too long ago.

Write down your fantasies of what you want to do with him when he gets home. If you feel too shy, pretend as if you are writing in a diary. It might be kind of weird and awkward at first but you will get more used to it and more comfortable. Don't worry if you don't feel comfortable typing some things. Do what feels right and have fun with it.