That is an ambitious choice for your first plant. It will need a lot of light indoors (as much as you can provide) and you will have to watch the watering, so you don't do it too often or not often enough (wait until the soil is almost dry). 2 meters from a south facing window is about 2 meters too much. These plants crash real fast in low light. When you pot it up, be sure to use a well-draining soil with lots of perlite/pumice/whatever. And according to my guide book (Pachyforms, which I recommend, covers a wide variety of species) it does not require a winter dormancy, meaning you can/should water year round. Watch out for bugs. I can't tell what the white spots in the picture might be, but bugs are a known issue with this plant (supposedly making it touchy to grow) so best to keep an eye out and stay on top of the situation.
