Best way to isolate a drawing

[#1]

Hi!

I have a drawing and I would like to remove the paper background and put a different background what is the best way to do this in PS? I tried to remove it using the quick selection tool it did not workout so great.

I am looking for the quickest way possible. Thank you for any feedback regarding this matter. 

[#2]

Hi!

I have a drawing and I would like to remove the paper background and put a different background what is the best way to do this in PS? I tried to remove it using the quick selection tool it did not workout so great.

I am looking for the quickest way possible. Thank you for any feedback regarding this matter. 

[#3]

I have figured it out using the quick selection tool I was missing a step in the adding the mask.