These posts can get your ball rolling. The first one is pretty detailed, I started with copy-pasting a large hunk of code from it and using as is.

Once you get the hang of it, the second one gives a gentle introduction to the entire process of capturing, refiling and prioritising.

http://doc.norang.ca/org-mode.html

http://www.newartisans.com/2007/08/using-org-mode-as-a-day-p...

Also, this one on quickly capturing anything from the browser:

https://orgmode.org/manual/Protocols.html#Protocols