How to setup sharing between PCs

I have the free version of CIS, and I’m having trouble configuring it for sharing between PCs in my non-domain network. I use to use Zonealarm suite, and never had a trouble setting up the sharing between computers. But for some reason I can’t setup sharing things like files and printing etc.

I have one PC setup directily to comcast modem, then I have a dlink DIR 615 wifi router going out to my personal computer thru the modem to wifi router, and my laptop in another room wirelessly.

I hope I explained myself correctly enough.

Can anyone please help me out?