Ok, I've moved around a lot and I think it can be really exciting and I think it will be a great experience. But yes, it can be isolating, though I don't think you will regret it! These are the things that have helped me.
* yes, as SunflowerFields said, be active in your attempts to meet people. Whenever you meet someone, tell them your situation, tell them you want to meet people, and a lot of people will actually be happy to include you, introduce you to their daughter/neighbour etc that is your age, and so on.
* if you don't speak the local language, expat groups can be super useful both for the company and for giving you tips on how to manage life in your new country. Ten years ago, when I moved to a country where the food, for example, was quite different from my own, the expats who had been there for years handed down tips about how to cook the things you missed, or told you that there was a tiny store selling imported goods down some back alley you never new about... . This kind of advice can be invaluable. I guess that a lot more of this info is on the Internet than it was ten years ago, but I still recommend that you get in touch with an expat group as soon as possible... . They can be super useful.
* accept that sometimes you will be on your own. When it happens, make a conscious effort to just be cool with it. Being on your own in a new country can be AWESOME. It lets you be impulsive, it lets you explore. Appreciate those

* WORK at keeping your support network in place. For me, I made a point of Skyping my family at the same time every day. (If I was in the house.) I'm not saying it has to be this restrictive, but MAKE IT A HABIT. It is SO easy to lose contact with people, especially if you are busy and having fun. But there will probably be some time when you have a bad day, when you feel isolated, and having those people there, in your life already, will help you immensely.
Bon voyage! Have an adventure!
Red