You must be with nodejs 3.. installed globally in order to make sure that gulp tasks will be well executed
npm run make-dev
This command will start by install all the nodejs and bower vendors to the project then transform and copy /src files into /web folder.
npm run start-dev
This command will start a localserver on /web folder then watch /src files changes to transform them and copy them into /web folder. It will also auto reload your pages at any change detected