How do I get Normal Dreamcast games to play on Chankast

I Already have the bios and flash what am I missing? I'm trying to just put my old dreamcast games into the computer and play. Like Jet Grind Radio or Street Fighter 3 or even Grandia. Do I need another program to read Dreamcast CD's? Anyway I'm new to this whole emulators thing. Help me out please. Thanks.

Try downloading Dreamast ISOs (DON'T ASK WHERE!). I don't think Dreamcast CD-ROMs cannot be read by your computer's CD/DVD-ROM drive.

Dreamcast games are on GD-ROMs. These can not be read by a normal CD/DVD reader. You will need to download CD images or create the images yourself by using a transfer cable.
I would go for the first option, since I don't know how to transfer them

It will be difficult to find DC games to download.