Macintosh classic 1991 computer

I have no idea what i should sell my macintosh at or should i wait and hold on to it. Do you people know if i hold on to it for another maybe 5-10 years will it be worth more in value or less. My computer works great and has all the biggest ram and storage it came out with. It was made in January 1991. I have the mouse the key board and the display all working great and clean. I also got a question if i can hook it up to the internet and what cords i would need in order to do that. Also the sound of the computer very very quite i turned it up all the way it still like nothing is their anything wrong or just how it was back then (yes i did plug in a audi jack speaker). I just basicly not sure where to turn to now because i got a guy wanting to buy it but now im looking back and seeing should i just wait??? Please help also this computer way older than me and i plan on it helping towards a car or college and i could use the most money possible. I flip things like this currently doing fire hydrants. But this i feel could go up in value but i just need expert oppion. Please tell me as much as you can about it due to me not knowing like anything (i dont even really know what a floppy disk was for that how little i know about this)