HOW DO I GET MICROSOFT OFFICE INTO MY ACER LAPTOP i3-2377M CPU

If the laption came with Microsoft Office then it should have been preloaded and the documentation should have included a key. If not you will need to purchase a licence and either download or obtain the media. Which one will depend on whether you need Outlook and other components.

Then you have a choice between 365 (good for a year) and perpetual. It is up to you.