The easy way is to make your base clip art in Inkscape Or Adobe Illustrator as vectors then use fusion to extrude from your vectors.

I would recommend this
https://www.ebay.co.uk/itm/FUSION-36...sAAOSwr~lYnHxr

I found this dvd useful to get my head round the interface, it's not a how to model tutorial it just breaks down the tools and how to use them so if you have no prior experience you would want additional help.

Youtube and autodesk has some excellent resources for getting started