No experience in video filming?

Hey I want to start filming for YouTube for motocross,skateboarding,snowboarding,wakeboarding,surfing,bmx,vlog,day in the life's videos and I would love to know what are some tips I can do to start I have and I phone 5 and a GoPro hero 3+ black edition with a selfie stick that goes to 20" and I have a Apple Mac pc but I don't know what software to use or how to make good videos or don't know if I should use I phone or GoPro or what I need?

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