moving to Buenos Aires

Hola everybody here :)
I'm moving to BA next week, i would like to training Muaythai / thai boxing as freelancer.
just want to know few things
where is the best place to allocate ; like urban safe and people may love joining sports such kickboxing
what I should do to legalize my residency or what I should apply for temp visa .. etc
is it easy to rent a space for making my own gym and should i get approval from government for running such that business sport.

last and least ; is there any general advise i should keep in consideration please ?

Regards ,

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