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Ittiandro,
As you will have seen from the other replies you've received, Calibre (and Calibre Companion) are quite different from the reading app that you need to actually read your ebooks.
I suggest you put Calibre out of your mind for the moment. Focus on choosing the reader app that you feel most comfortable with. Never mind what formats it supports. Concentrate on finding the app which gives you the features you want, and that you will enjoy using.
In particular, pay attention to things like how easy it is to turn pages, to open the table of contents, to jump to specific locations, to search the text, and so on.
You've already seen some recommendations for reader apps. You should also visit the Google Play Store, where you'll find many more apps on offer. Look at the descriptions, read the reviews, and download a few apps to experiment with (fortunately, most of them are either completely free or have a free version).
Once you've found an app that you're happy with, that will determine what format your ebooks will be in. Most apps support epub format, but there are others as well.
Now, having done all that, you can turn your attention to Calibre. If you need a utility to convert your existing ebooks to the format of your chosen reader, Calibre will do that. It can also help you edit a book's metadata (for example, if you want to add your own description or rating), change the cover, organise your books into collections or folders, and generally help you keep track of library. Hwever, despite its many uses, it is not essential for reading ebooks.
Calibre runs on a PC or Mac, not on the tablet. This means that you will maintain two copies of each of your books: one in Calibre and one in the tablet app you use for reading. That's where Calibre Companion comes in. It is essentially a tool (which runs on the tablet) for keeping the two libararies in sync. Again, it is not essential, but it is very useful. Depending on your tablet, you should be able to connect it directly to your PC and Mac, and to transfer files without any additional software.
To summarise: first choose your reading app. Then, if you feel the need, install Calibre (on a PC or Mac) and Calibre Companion (on your tablet). But keep in mind that Calibre and Calibre Companion are very useful, but not essential. Above all, don't let all these tools get in the way of your reading. Remember, the end product is to enjoy your books, not to spend your time installing and configuring software.
Mike
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