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I am new to developing OSs and was looking for some help.

I have several asm files that have methods in them. I need to run these from another asm file.
I think I need an %include, but I have had no luck in getting it to work.

Any help is great!

Linking.

Got it! Thanks!

How would I go about running a file on a floppy in a bootloader?
(I have no interest in using GRUB)

One simple way is to not have a filesystem, and just treat the disk as a collection of sectors. Use a disk editor to write your file to a known location, then have your bootsector load it into memory and execute it. It's a quick way to get started, but it's also least flexible way.

An alternative route, which requires more work up front but makes things easier afterwards, is to write a bootsector that's capable of reading the root directory of a simple filesystem, locating a particular file, then doing the necessary work to load it into memory (however it may be laid out on the disk) before executing it. Assuming a simple FAT-formatted floppy, you can then just copy your file to it without resorting to special tools. And that file can be anything you want, from a simple "Hello, world!" test at first to a complete second stage bootloader capable of doing all the things you couldn't squeeze into your initial bootsector.

I got it working with your reading of the fat file system. Thanks!

Is reading off of a cd/dvd similar to a floppy?

A quick forum search turned up this post, which sums things up rather well.

Thanks!