Definitely mono for your first bag. Altho a lot of people carry those, it's the most widely recognized as LV and you want your first bag to be noticeable. After all, why pay that much if it isn't going to be admired?? lol
I also think it is timeless and less upkeep than a damier azur. Ie- color transfer from denim onto the light canvas.
Damier ebene would be my next choice for you, for ease of use and no vachetta handles. I think the azur is very high maintenance for a beginning LV'er if you aren't used to having to be extra careful with a bag.
You have made great bag choices so far tho, love that you have the blueberry bal bag!
Let us know what you decide!