Besides getting a prebuild NAS you can try to build one yourself, but since you're saying that you're not tech savy I would suggest to get a prebuild one. Furthermore, although building one on your own can be a bit cheaper in some cases but you don't get support for it and is harder to set up and manage later on.
And yes, you can use My Cloud to access your data from all around the world. You can take a look at this KB article bout how to access the Cloud with different devices:
Hope this helps and feel free to ask any other questions you may have.
Hello, I'm after a personal cloud storage system that I can access between Kenya and the UK. I'm looking at the more easy to use ones as I'm not techy (the WD my cloud). Can all personal cloud systems be accessed from anywhere in the world?
Also, can I easily move it to a new wifi connection so that my laptop can access it from different homes? (i.e. It would be in my home when I'm in the UK and at a different UK address when I am away).
And, how easy is it to access the data from a friend's computer or smart phone?