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what is Sirius's absolute magnitude?

how meny times is Sirius brighter then the sun?

m1-m2=-2.5lg(f1/f2)

this is the equation i'm supposed to use, its the one they gave me.

i think it is much more oppropriate to use:

m-M=5lg(d)-5

and then just dividing to find how much brighter he is.

so, what unit does the distance "d" needs to be in? and how do i calculate the answers with the first equation?

and what is flux? i couldnt get a clear explanation anywhere.