Hello and welcome to JustAnswer! My name is XXXXX XXXXX thank you for giving me the opportunity to help you with your networking question.
You have a couple of options. To remote in, a static IP is needed if you are going to use Microsoft's Remote Desktop Connection.
As a free alternative that does not require a static IP, you can use the free version of Log Me In. Here is the link - you will be given a trial of the pro version, but the free version will continue after pro expires. No credit card needed...