아침 8시에 회사에 출근해요. Mean "go at 8:00 AM" or "at the company at 8:00 AM" ?
Also
This sentence :아침 8시에 회사에 가요 mean "I begin to go to work at 8:00" am or "I'm at my company at 8:00 am"
Could I use 오전 instead of 아침 for those sentence ?

Question

아침 8시에 회사에 출근해요. Mean "go at 8:00 AM" or "at the company at 8:00 AM" ?
Also 
This sentence :아침 8시에 회사에 가요 mean "I begin to go to work at 8:00" am or "I'm at my company at 8:00 am" 
Could I use 오전 instead of 아침 for those sentence ?

Answer

It means 'I go to work at 8 o'clock in the morning.'.
And 오전 means from 12 am to the noon so it includes midnight, dawn and morning.