Step 2

Okay, it looks like GraphPad will work for you.  Go ahead and download GraphPad R7 Configurable from the App Store.  This version will require you to sign a month to month lease, but you'll still have a 7 day trial period.  Download it, and let's get started for real...

The first thing you'll want to do is try out the built in forms.  If all you want to do is create a drawing for you client, there's a couple of blank forms as well as a sample proposal you can use.  Try those out along with the built in libraries.  Some clients don't need anything more than this!