how do i download the saftware onto my outlook for my PC?
Please head to this URL (http://todoist.com/outlook) and click on the "Get the App - It's Free" button near the top. This will download the .exe file which you can double click to install.
Once it's installed open up Outlook and the Todoist panel should be there on the right hand side. If the Todoist panel does not show up please tell me which version of Outlook you are running so that I can help you further.