First, check out this great video we made (ahem, I made), that covers crossbars, installation, and tent selection:
To find a good roof rack for your vehicle, we suggest checking out www.etrailer.com.
There, you can enter all your car's information and then navigate over to "roof racks". You will see all the available options that fit your specific vehicle. Look for something with a capacity of 130lbs+, depending on what tent you want. All of the major brands are very similar in quality, so I'd just pick the ones that fit your budget!
For more information about deciphering your specific type of roof, check out this article.
For more information on how crossbar weight limits work, check out this article.
Also, check out this Youtube video walking you through the general installation procedure. The tent shown is a Sparrow tent, but all of our tents will install in a very similar manner.
If you'd like more in-depth instructions on installation, check out this page.
If you're trying to mount on a platform rack, head on over to this article!