If you opened the terminal/cmd in a directory and cloned there, there should be a folder named 'The-Powder-Toy' in that directory. That's the tpt source
Define "TPT folder". If by that you mean where you run TPT, no, they won't magically be there. Users download the prebuilt binaries (i.e. what the huge download button gives you at the home page) because they don't want the source. For the source you should head over to the GitHub repo. Read the wiki for more.
ok i downloaded the github repo, what do i do with the contents
do i put it in the folder where i run TPT?