Its not a stout, its a trappist beer. Ratebeer.com has put it in the Style: "Abt/Quadrupel"- category. It is also my favourite beer in the world!
If I was new to home brewing, i wouldnt start by making an AG rochefort 10. You WILL screw it up the first times, and I made a hell of a mess out of my kitchen. And screwing up a rochefort 10 is much easier than screwing up a simple, small beer + the required aging will be close to a year for a rochefort 10 + is much more expensive.
If you want to start home brewing, you can either start extract, partial mash or all grain brewing. Personally i went straight to all grain brewing because I thought I was more clever than everyone else, but the result was that I ruined four batches before I was starting to get results that I thought were drinkable.
My advice (and I am by no means an expert) get a book like "How to brew
" and start on page one.
Make a few small batches of light ales, they are not too expensive, and they are easy to give away to friends if you think they taste yuck :P and they dont age too long or need too strict temperature control to avoid them going out of style during fermentation.
A clone like rochefort 10 requires three times the work (if not more), and many more ingredients
Welcome to the forum by the way. The people whom are here are great guys! Best forum I've been on in my life.
Best of luck.
Kind regards from Norway