The only dependency you'll have to install yourself is node.
I highly recommend that you use atom as your editor, along with the atom-typescript and linter-tslint packages.
I also recommend SourceTree as your GUI for git and managing the repository.
Before you can run the project for the first time, go into the project root directory in your preferred command-line interface and run npm run -s setup.
After that, you only need to run npm run -s run to build and run the application each time.
Changes should be made to the typescript files in the src directory. Any files under build or any other directory are not tracked by git and should not be changed.
Once your changes are made, create a pull request and the rest of us will review it and merge it :).