Put yourself in the shoes of a potential hiring manager. If you're a total stranger to them, and you come inquiring after an easy-to-fill position that you can't take until 2015 sometime, you may be perceived as wasting their time. Worse, you may be seen as trying to get them to pay for international relocation, which is expensive. That's the downside of getting started early on your job hunt.
If you have distinguished skills and experience and you happen to know which companies in your field really need you, it's an entirely different matter.
The same is true if you have friends / former colleagues at some of your target companies.
In other words, at this stage it's too early, I believe, for an overt job search. Instead, you'd be wise to develop your relationships.
How can you do that? There are all kinds of ways.
- You probably have some idea what companies you hope to work for.
- LinkedIn works for many people.
- Another thing you can do is use Meetup.com to locate affinity groups in your specialty in your target geography. That's especially helpful if you're planning an exploratory trip: you can go to meetups and have in-person conversations about who's doing what.
- Craigslist has lots of job postings. You can scan it to figure out what kinds of jobs people advertise for.
- You can try writing to or telephoning acquaintances and asking them about their work and companies. People love to be asked about themselves, and will introduce you to other people.
- You might ask acquaintances for an introduction to a respected agent (headhunter). There are some really good headhunters willing to work with a situation like yours when you get closer to moving, but you will have to do a bit of work to find them.
- This web system, specifically https://serverfault.com/ is designed to help tech domain experts identify one another. It's worth a try to look for people who make good contributions (answers, mostly) and try to get in touch with them.
In all cases, talk straight. Tell people you're thinking of relocating six months out, and you're trying to figure out what's going on in your specialty.