As many as you want to, there is no limit.
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Just go to the most viewed page or go to the popular and make that type of video. If you are looking to be a partner, and you think sub4sub is getting you anywhere, you can just stop dreaming. You will get nowhere. So just be yourself and make well-made and interesting videos and people will subscribe. Spend time to learn how to edit well. Vegas Pro 7, 8, 9 are probably the best editing programs.
3%
I don't think you need a specific number of views to get paid. But you will probably need some steady activity on your videos in order to be accepted in the YouTube Partner program.
If you post good content then people will appreciate your efforts. People will share your videos and thus you will get views. Remember that quality content is important when it comes to getting views for your videos.
It would depend on the size of the people.