you need a printer with a scanning feature to scan, or a device that scans if you don't have one then go to Officeworks. the documents may or may not scan as pdf's, if they don't then just use png to pdf converters online, or word to pdf (can be done on word just save as pdf) etc.
if you’re on an iphone just open notes and open a note, click the camera icon and then ‘scan documents, scan the document and then when you’re done save it, then click the down arrow and share
Adobe Scan: This mobile app allows you to scan documents using your smartphone's camera and convert them into high-quality PDFs. You can save and share your scans easily.