Multiboot on an External Drive - Grub questions
I'm currently running windows 7 on my computer and despite a little experience with programming and building computers, I'm a complete novice when it comes to Linux. Because I don't know how to fix any problems I encounter and don't want to ruin my current system, I want to get my external hd rigged up to boot a couple distros to get a feel for them. I think I almost know how to set it up except for a few hangups:
1. Do I need to create a partition exclusively for GRUB? If I do, does it matter whether it is primary or logical?
2. Once BIOS is set to run from my external, how do I make sure it runs GRUB? Do I need to mess with the MBR, and if so, how would I do that?
Also, if anyone knows of any good sources to use to learn more about multiboot, that would be much appreciated. It seems everything is written for people who already know a lot about grub and linux.
Thanks for the help!