Thanks, helped me understand a lot better.

Yes, FamiSlayer and Vegaplay are wrappers for a NSF; they produce a ROM that is runnable on hardware or an EMU. The NSF is just the the music data and player code, and must be called at a regular frame rate, usually at the video rate. The PowerPak has NSF player code just like most EMUs so you wouldn't need VegaPlay to build a ROM. For making your own cart, you must provide the code to setup the system and continually call the NSF play routine, this is what VegaPlay does for us. FamiSlayer waits for a 'button press' before playing the next frame of the NSF.
You can make a multi song NSF in FamiTracker and if it's not larger then 30K, use FamiSlayer or VegaPlay to build a ROM. But each time you will have to re-flash your cart with your new ROM.
Yogi

So for flashing famislayer with nsf do you have to re upload the rom to add a new song every time?

Ps. I don't blame you for being rude   I keep forgetting to research before I ask questions... sorry..

Most people use  PowerPak or N8 to play NSF direct, but there are other ways. Famitracker exports NES files that can be used or you could use VegaPlay of FamiSlayer to pack a NSF in a ROM file that can be played on standard NROM cart.
Check out this wiki-
http://wiki.nesdev.com/w/index.php/NROM
  You could replace the chips on an NROM cart; but for this you need to remove the chips on the cart, flash new chips with a burner tool and resolder the new ones on the cart.
A lower cost route could be one of Infiniteneslives' flash carts. With one of these you would need a cart edge programmer, the original design is called a Kazzo and INL has an updated design. His site-
http://www.infiniteneslives.com/products.php
There are a lot of mapper options but VegaPlay or FamiSlayer only uses NROM (which is no bankswitching). INL has a NROM board that should be released very soon.
Yogi

http://lmgtfy.com/?q=nes+flashcart&l=1

I hate to be rude but it says right on the FamiSlayer page:
"Enter the LOAD, PLAY and INIT addresses for your NSF in FamiSlayer.asm
Remove the NSF header
Rename file to temp.nsf and compile
Rock out w/ your clock out!"
http://www.heavyw8bit.com/famislayer.php

I promise I won't be rude if you PM me any questions you have, might be better than bumping old threads and making new ones

And also how would you go about putting the song onto a program like famislayer?

So I've seen a lot of people say you can just make a track in famitracker and then port it over to an nes card and play it on the nes. My question is which card would you use and could you make you own card?