@pacodelgps
Read very very carefully and all references from it:
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You are asking really beginner's questions that have long since been answered

All the material is present on the forum, you just need to take the time to browse it

Since I know you are interested in truck-oriented use, also read, for example
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You will have to solve local language problems yourself by browsing the appropriate Primo lang/voice section
And by that I also mean the most adjustments to the local skins, if they exist at all