Does your JVC headphones have a mic on it? The newer computers with one headphone jack are similar to the jacks on phones. You need a...
If it's too old to run anything, best bet is to get something new (or newer). I have a 2009 MacBook that still runs well and it's running Sierra....
I'm a fan of the mirrorless cameras when it comes to filmmaking as they are more compact than the DSLRs. I guess it really depends on what you are...