The best way to recruit people is to get them in vent, be friendly, and then ask them if they're interested in joining.
If they are, what you can do is show them the steps to apply. You'll also want to tell them to put your name down for the Recommended By if you recruited them. If you ask them and they are not interested, you can add them on steam, and speak with them daily. Then, after a while, because of your friendliness, they might want to apply!