Where can I get my subwoofers and headunit installed?

I just boughta headunit-Soundstream VR-64H2B
Metra Dash kit-
and 10 in MTX Magnum MB210SP dual enclosure
and BOSS Audio KIT2 8 Gauge for my 2012 ford focus.is that enough for my car to be hooked up and also does anybody know about my headunit because their were no reviews for it on crutchfield… Also where can I get it installed locally and how much would it cost And would it take long. Also is that a good set up for a ford focus?

On top of the dash kit you should also pick up a radio wiring harness. Usually <$10 on ebay, but varies from car to car.
Soundstream has only recently entered the head unit market. Being primarily an entry level brand these days, and a sibling brand of Power Acoustik -- I would definitely keep expectations in check. HOPEFULLY it will work fine initially. I'd be more concerned with long term reliability. And anytime a HU claims 300w anything -- it should raise suspicion, but 300x4 should be considered an out assault on any potential customer's intelligence.

The subs and amp are very low power and generally about as cheap as it gets.
The amp has a 20A fuse. Probably produces somewhere in the vicinity of 150w rms, or 75w per sub. About average for a decent pair of 6.5" door speakers.

So you have a low cost, feature rich head unit and dirt cheap bass package.
Whether it's "good" or not depends on your level of satisfaction.
Personally, I would have held off and saved more, but maybe it will do what you want it to do.