Solidworks File in Mastercam
1) In Solidworks save files as STEP 214 file format
2) In Mastercam open STEP file.
In Mastercam you may have to create curves on the part edges. These curves help to create contours, pockets, holes, etc. You can create gcode on surfaces but if you are used to working with wireframe creating curves is easier.
Training books on Mastercam are available from emastercam.com. Mastercam comes with pdf files on how to use it but some prefer the training books as they have small projects that show you how to do them from start to finish.