a. "If you do this, you make/will make fingerprints."
b. "If you did this, you would make fingerprints."
Note that the "put" in the sentence is both present tense and past tense, so either would work, but "roll" is present tense. So the pattern is as in my sentence a.
If the sentence had "rolled", you could put "would make".
2 A, D are correct. I prefer 2 D.
B and C are not possible.
I would say, "Your fingerprints will still look [very] much like they do now."
3 C. "Long ago" is the only idiomatic choice.
With "long before", you'd need to say, "Long before [something], ..."
Student or Learner