First, download the My NBA2K app on your mobile device, and make sure to get the daily VC bonus and do the Pick-and-Win every day on there as well. That's the easiest way to get VC IMO.
Second, use custom rosters to sim through a MyGM season. I use a roster titled something like "YouTubeDooooogshere", and I earn 900-1000 VC every time I sim a season using those rosters.
Thirdly, just play some MyGM games. You get 925 VC for a win and 800 VC for a loss. Not bad at all.
Using these methods, I've been able to earn a decent amount of VC to use towards my MyTeam, so I hope you can too.
Good luck!