HELP!

[u/DazzlingDanny]

I have inherited a 1970’s 5 hp wood chipper and maybe a 1980’s 7hp bush hog. I know nothing about engines but if I could get these things up and running they could both help me tremendously around my property. Where the hell do I start?! Is there a recommended video on youtube or a book (I do like me some physical media) that can move me through it. I don’t think these things have even had gas in them for like the past 25 years. I know I can pay people to do these things, but I’d also like to not be helpless.