Greetings Darin - welcome to the Minnesota Astronomical Society!
And, congrats on your upcoming 8” Dob - an excellent choice in a first telescope. Also, I am thrilled that you have discovered the Astronomical League’s Observing Programs. If you allow them to do so, they will help you organize your observing sessions, allowing you to see stuff that you never before considered possible.
As to your specific question: I’m not sure what BOG might refer to (perhaps it’s a Canadian thing). Typically, Limiting Visual Magnitude is best determined by looking at the stars in the Little Dipper and determining which stars you can see at any given time of the evening. If you Google ‘Limiting Magnitude’ you will find a plethora of excellent explanations and methods. Anything that works for you works. Thus, the definition of ‘limiting magnitude’ is: what is the dimmest star YOU can see at any particular time. I’d be curious if others have run into BOG.
In regards to your REAL question: what can I get started with while I am waiting for my telescope - I would suggest that you DON’T start with the Asterism project (it’s hard in some unique ways) but start instead with some or all of the following:
1. Constellation Hunter. Learn the constellations by sketching them. Fantastic prep work for future telescopic observing
2. Messier Binocular. If you have a 7X50 pair of binoculars, you will be AMAZED at how many Messier objects you can see.
3. Universe Sampler. This contains many naked eye and binocular viewing opportunities, and you learn A LOT about observing in the process
4. Beyond Polaris. Another tremendous beginning observation project.
5. Lunar 1. Great to begin to get an idea of what observing the moon has to offer.
Also, take some time to look through the list required for the Observing Award - the first step to becoming a Master Observer, should you find completing observing projects is something that really inspires you. These observing projects are designed specifically for people like YOU.
Finally, you’ve come to the right place to ask your questions! These forums are chocked full of people who have the right answers for you. In regards to the Astronomical League Observing Projects - I’m your man; that’s my main job with the MAS. Feel free to reach out to me personally, should you desire:
jjones7777@aol.com
In conclusion: Welcome to the wonderful CALLING of Amateur Astronomy! We are glad you have started this journey of discovery with us.
Clear Skies!