Commander deck competitive

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well, im starting again with magic (this time i want to play commander in magic online)

i have this questions, if anyone of you could help me i will be gratefull.

How much dolars do i have to spend to make a good commander deck in magic online?

the precon decks, are good?, wich deck do you think its the best?, they worth the money or with the same money i could buy a more competitive deck??

is this format good for earning tournements (boosters and prices) in magic online or there isnt a lot of this type of game
thanks for all!