The $ 399 price, assuming you already have a compatible iPad, lets you visually scan rooms - as seen in the videos there - via a 'painting' sweeping motion and then get 3D models for a small price per room, with an extra fee for the US-based Canvas staff to integrate all of the rooms into a single model. If you have the skills, and are not overly concerned about money, then a way to get a head start on your home model is the Canvas app from Occipital which uses Occipital's Structure Sensor which you attach to an iPad: Again, big learning curve that is difficult to do without at least a few days with an experienced user/tutor if you are new to CAD / 3D modeling.
But at another level, if the home has complex levels and trim and other custom details that you want to model, then ARCHICAD SOLO, which is about half the price of the professional version, might be worth looking at. If DIY is your game plan, then at some level I agree with Brett about Chief Architect as being simple. I assume you are a reasonably competent computer user and have perhaps done some CAD before or are at least a bit 'left brained'? Otherwise, you should seek someone - even an architecture student - to assist you vs buying and learning a complex new program.
When this box is checked, a single wall opening with a header for the entire unit is produced.Is ArchiCAD the right software for this purpose? Or is there something else that suits our needs better?
If the selected object is a mulled unit composed of multiple windows and/or doors that have been blocked together, you can also specify whether the unit is framed using a single opening or separate openings for each door or window on the Options panel.On the Framing panel of the Door or Window Specification dialog, specify your desired values, then click OK.Select a door or window and click the Open Object edit button.It's best to do this before wall framing is built if these values are changed after wall framing is generated, you will need to generate wall framing again unless you have selected the Automatically Build Wall Framing option. You can specify unique values for individual doors and windows in their specification dialogs. To specify the framing for an individual door or window When you are finished, click OK, then click Done to close the dialogs.On the Openings panel of the Framing Defaults dialog that displays, you can specify up to four different sizes of headers for wall openings of different widths.Remaining in the Default Settings dialog, select the Framing option from the list, then click the Edit button.This option is only available in X13 and newer program versions. Uncheck this box to specify the spacing of the header boards. When"Evenly Spaced" is checked, the boards that comprise the header are evenly spaced within the wall's framing layer. The Calculate from Width settings are located in the Framing Defaults, which are discussed later. Keep "Calculate from Width" checked if you want the Header depth determined by the width of the door. Specify the Header Type, Thickness, Count, Depth, and Spacing.