HD Capture Cards/Studio setup help

I was going to be setting up a little mini studio in my garage, And was wondering if anyone knows the best way to use a DSLR camera to live stream and if I'll need a capture card or not, I'm pretty sure I need a capture card to.. well capture straight into Premiere Pro. Also. What mics can you recommend as well as interfaces to record the audio. My buddy has an old cheap 1/4 to usb interface so I was going to use that and a little mini like 4 channel powered mixer and his.. Not sure on the brand, but it's a decent compression mic, and just use that to record the audio. I'd love to get any help, thoughts, and opinions on this. Thank you.