Need Help: 240v in Garage?

So, I could actually junction off the garage and have a box for the compressor as I'm also looking at the IR 5hp 60gal. Then I could run a second 30amp to an actual plug for a welder. I just couldn't run them both at the same time. At least I wouldn't have the inconvenience of having to unplug one to run the other.
A video I watched the guy said to use a 10/3 wire as well.
Also, would I need to use a double 30a breaker or would a single 30a be fine? I think the double should be used with a 10/3 wire correct?