how to create a line by line effect vid showing what i want to do: 
                
            

if i have this image: https://i.redd.it/259hhktl49431.png
how would i do what the youtube video is doing with selected lines in that image?

im using hitfilm express 12 and i also have davinci resolve 15. im really new to editing and the closest thing ive done to try to copy the effect is create a mask around a certain line and then create a new mask that shows 2 lines, then 3 lines, etc
There's different ways of accomplishing this. The easiest method I'd use is to build the entire dialogue in Illustrator or Photoshop, then Import the psd or ai into after-effects and reveal portions of the text using an animated mask.