When I bought my land, I heard from just about everyone that I know in how much money I could make off of the different trees on my land...
...I figured that when it was all said and done, I would make less then $10 an hour, and that's if nothing broke down, got damaged or created other issues.
I found the same to be true with selling firewood. There just isn't any money in it after you factor in all the time it takes to get it ready to sell.
There are lots of different scenarios.
In 1987 I bought two parcels of land totaling 12 acres for $10,000. I sold the 4 acre one for $3500 and sold the
logs off the 8 acre one for $6500. I didn't do a thing other than deposit the check and watch the guys drive in and out of my driveway with money on the back of their truck. Five years later I sold the 8 acres and adjacent house (that I had also bought in 1987) for $40k more than I had in the house and land.
I know lots of people that make a very good living off doing nothing but selling firewood, and others that are loggers, log dealers, etc that also make a good living. Far more than $10/hour I can assure you.
Getting back to the OP, I agree with those that have said you won't know what you have until you cut it up.
However, it's extremely unlikely to be Bird's Eye. First off, BE is most common in Hard Maple. Secondly, BE does not reveal itself until you cut it - the tree looks completely normal.
Lastly, burl does not generally make for good "lumber", i.e. slabs to make stuff like tables. It's usually best to make either small or three dimensional objects like bowls or vases. I have a piece of a burl that was cut perpendicular to the grain which I made into a clock. The center is "regular" end grain with annual rings, and the burl projects around it. Cutting longitudinally (i.e. conventional way to make lumber) you probably will end up "wasting" a bunch of it because of the unevenness of diameter.