I agree with Shorepoint's suggestion that you use a tried and true Biabacus recipe for your first BIAB brew. The one he suggests is the one I (and many others) started out with, with good reason: it's already filled out (modify for your kettle size and desired VIF) , there's a methodology to follow, and it has proven integrity (read this http://biabrewer.info/viewtopic.php?f=5&t=2647
Also, read and modify " The Checklist" http://biabrewer.info/viewtopic.php?f=25&t=188
- this has been an invaluable tool for me
If the All Amarillo recipe doesn't suit your tastes, search this forum for a recipe of a beer you might like, download it and noodle around with it until you're happy with it, then post it and ask for input. Then you'll be ready to give it a go. You'll more likely be happier with the end result, and learn a lot in the process.
Good Luck, and let us know how you do!