possible to setup my iMac as a VPN Server?

Hi all

I am going away in a week for 3 months, i will be going to Iran, over there certain websites are filtered and accessing my Paypal for example will have them close my account down. The filter websites and then they sell people VPN cards you purchase that will allow you to connect using a VPN! Basically beats the point of the whole censorship, but I guess anything to make a quick buck goes with these criminals.

Anyway, the cards are quite expensive, so i was thinking if there could be a way to setup my iMac here in the UK to be a VPN that i can then connect to remotely. I dont really need access to my files or anything as i have an Western Digital MyCloud that i use the iPhone app for to access my files so thats all good, just need a VPN.

I saw an app on the app store OS X Server, anyone have any experience with this in regards to what I need to do?

Many thanks