I am trying to install MIT-Scheme so that i can use it off my terminal instead of using an IDE, however, I am having difficulty trying to find tutorials that are actually up to date and works.
You can install MIT Scheme through Macports, and it will probably take a long time (it's compiling it from source, I think). You can also get a precompiled binary from here which will install an MIT-Scheme.app which starts Edwin an Emacs port or something which includes a Scheme debugger and REPL. But you can also start it from the command line.
Check to see where it installed to, on my machine it's here /Applications/mit-scheme.app/Contents/Resources/ but that might vary. Add this directory to your PATH by editing ~/.bash_profile and adding this:
export PATH=$PATH":/Applications/mit-scheme.app/Contents/Resources/"
Check with which mit-scheme to make sure it installed correctly.
As for Racket, there's also a precompiled binary available from here. (It might be in Macports but it might not be, or in Fink, I don't know. I try to avoid those and use Homebrew if possible.) This is a dmg file which you can extract and put wherever you want. I put mine in ~/bin and added ~/bin/racket/bin/ to my PATH as well, same process as above, but you can put it anywhere, /Applications/ or whatever.
Good luck.