This is one of those projects where the answer comes awfully close to:"if you have to ask...".
That's a big project you're talking about, interacting with several systems. All of which have difficulties of their own. The best advice I can give is splitting the project up in smaller, more manageable pieces. You're not going to find a guide of tutorial that shows you how to do the project as a whole, but there might be ones out their for parts of it.
The topic you linked to is a great example of that: it shows you how to do the device -> server part, as well as a server -> webpage part:
So, you've got the code to get your data to a local node.js server, now you'll need to find a way to store that data in a database somewhere. For that, there are tutorials available. Then, you need to figure out how to make a nice front-end to display said data, for which there are tutorials available as well. Then, you need to figure out how to get the data from the database to said front-end, for which there are guides, too.
There's a reason there are services out there that are making good money from this: this isn't the easiest things to do, and will take some serious TLC even if you're familiar with systems like these. It depends on how much your time is worth whether or not it might be a good idea to invest in one of the existing platforms, or DIY something.
Should you go for DIY, then break if down into sizable pieces, and go at them one by one, not all at once.