Most VAs are in lower cost coutries because that's what it takes to be competitive in the VA game. There are many VAs in the US, however they tend to charge significantly more per hour.
There will probably be some form of language barrier. Most of the Filipino VAs I've hired speak English well, but their writing is clearly not written by a native speaker. You'll need to hire a few before you find the best one. You can record videos on your computer of you doing your task, then send them the video. I use Screencast O Matic to record those videos.
A good VA can save you a crazy amount of time. Getting to that point is difficult but worth it.