This is just a question in general. "He is a good marketing director. Beyond his English is excellent". Another example would be: "We would offer you a quantity discount of 5%. Beyond we would offer you a cash discount of 10%.". Thanks a lot!
You can use "besides" like this, as you hinted in #1, but if you do, it needs a comma.
But you can't do this with "beyond". At a pinch, you could do it with "beyond that" (again with comma).
Sound shift's "In addition" is very good, or you could say "And what's more,".