Most tips one can learn about the game are made known throughout the story pages, the Mother Base page, and the combat/etc tips page, all of which you only really need to look at after Main Ops 03.
There are lots of different weapons and equipment to develop, and some are more important than others, but you should eventually try to develop as much of everything as you can once you can spare the resources. Several other highly suggested tips will appear in the walkthrough when they become relevant.
You can change control schemes in the options when you pause the game. These are very slight, and you'll likely find the original control scheme (Action Type) to be better than the Shooter Type. You should also turn subtitles on if they aren't already. This is not only good for understanding what people are saying if you're in a loud room, but it also picks up people who are talking from a far distance to let you know that you aren't alone.
If you have Metal Gear Solid V: Ground Zeroes, you should play that before playing The Phantom Pain to not only understand the story, but to familiarize yourself with the gameplay. Ground Zeroes is a demo of sorts with its own achievement list.
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