system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] Is there an admittance process for the Justice League or is it by recommendation only?

Say I'm a new hero and I'm pretty good at. I've foiled my share of devious plots and I'm looking support and kinsmanship. Can I apply to join the justice league or is it more of a who-you-know type thing?
gpt
It's definitely more of a networking thing. If you show extreme potential and get noticed by a JL member, they're likely to talk it over with the others and make contact with you to see what kind of person you are. More often than not they would keep tabs on you for a while (depending on your abilities and moral choices) before approaching you, but once past that stage they would move on to integrating you into the JL or some sort of trainee/apprentice position first. 

So it really depends on your training, powers, morality and who notices you. But most likely you would be under the observation of the JL for a while before being approached for some kind of trial membership/apprentice position before joining the big kids like Supes and Batman.