So I played Everquest for 3 or 4 years and thus missed out on the Nintendo 64 and Playstation era. I LOVE video games! I have a 2 year old boy and I just can't wait to play games with him. So I was at the yard sale and I see a box with a Nintendo 64, a switch (to switch between consoles! BONUS!!) and the following games, Legend of Zelda Ocarina of time and Majora's mask, Mario Party 3, donkey kong 64, etc  Got it all for 15 bucks!!! Sweet!!

Now my intentions were to play this with my son and experience the games together for the first time.... i just don't know how long I can stand not playing these games!!!    

That's a damn good deal for that.  Don't forget to get Super Mario 64.

make sure to get super mario 64 too :P

Another suggestion, pick up the original Smash Bros., especially if you want a good game for you and your son.

That is a great deal. I still need to get the power cable for my N64... I lost it. :/

That's a great deal. The N64 is my 2nd favorite console behind the PS2.

Get Pokemon Stadium 1 & 2.

There's nothing wrong with the system, those games really do look that bad.

Banjo-Kazooie is an absolute must. Banjo-Tooie is cool too. 
Star Fox 64 is legendary. A must have.
Goldeneye and Perfect Dark were both amazing games.
1080 Snowboarding was really cool, and Wave Race was too.
Mario Kart 64 was pretty good, but best when playing with 3 others. I don't think it holds up that well, though.
Paper Mario was a classic. 
Excitebike 64 was fun.
Tetrisphere was a really cool take on the series.
Star Wars: Episode 1 Racer was a great racing game. Star Wars: Rogue Squadron and Star Wars: Shadow of the Empire were good too.

Amazing. Now get Super Mario 64 and Smash Bros. and your pretty much set on gaming for awhile.
 
N64>>>>>>>>>>>>>>>>>

Star Fox 64, Star Wars Rogue Squadron, Super Mario 64, Legend of Zelda: Ocarina of Time, Paper Mario, and Banjo-Kazooie. You NEED these games. =D

Your going to have so much fun! 
The earlier mentioned are fantastic, which you really should play. Another little gem I do want to add as my personal favorite and especially when you're going to play with your son is Rocket: Robot on Wheels! 

Also, get Jet Force Gemini:)