If you haven't even started to use this Total Cad product, I'd suggest you'd be better off investing your time on Fusion 360 instead. It's also completely free but has the advantage of being actively supported and in development. There is a massive support community and plenty of learning tools.
BTW Nige, it doesn't "run online" (you might be thinking of Onshape?). It installs on your machine (Windows only) and you can use it offline if you prefer but updates are automatically installed. As mentioned, it is still being actively developed, so new features come along at each update (typically every month or so).
Murray