What gun to get

Long range, very accurate, low recoil; Now you've opened a whole can of worms. :lol:
But your request to limit recoil has,automatically, slammed the door on the magnum crowd.

I suspect you are going to be limited to no more than 4 or 5 chamberings. .260 /6.5x08, 6.5x55 (a nod to my scandanavian and european bretheren), 6.5 Grendel (a nod to the cutting edge Highpower crowd), 7-08, and the 7.62 or .308 caliber. There are obviously more, but these seem to cover the field from my perspective anyway, for inherent accuracy and low recoil for the chambering (especailly if you are migrating from an air rifle).

As to how much dirt you need is a harder, there are volumes of regulations printed by the federal governement and separate state governments on the topic. Suffice it to say, you'll need more dirt in any direction than you can possibly shoot from any rifle that you can think of, or in combination, need to create and maintain compacked earthen berms and barriers to catch your bullets and prevent you from shooting into your neighbor's land (they get a bit cranky when that happens)

Seeing as you are probably going to be moving with your parents due to being underaged (You're probably from Quebec too, guessing upon the fact that A) They are moving to france, so they speak French obviously and B) Your english is bad, but it exsists, plus you have internet access, and can afford a gun, so that rules out the ex-French colonies, leaving only Quebec and France, pretty well), I would suggest you check out the French firearm laws beforehand.

For what you specified, you probably want one of the rounds Jeffvn mentioned, although the more common arms and ammo tend to be for the 6.5x55 and the 7.62x51 (.308), and seeing as they are more common, they'll probably end up cheaper. Keep in mind though, the .308 can be effectively used in some rifles out to 1000 yards, so that is one large piece of field you'll want to make sure you have. And, of course, try not to shoot downhill. Misalign your sights too low and you'll have bullets flying into the valley below. Not very much fun for the people below.

A Silencer is... iffy. A Silencer isn't legal in Canada, and approaches Illegal in the US, and i'm laying odds that it won't be legal in France. But there aren't too many bolt action rifles that are threaded for silencers, and pretty well none of those are civilian issue. You'd probably have to get a custom barrel made, and have it threaded.