Please, how does ads work?

Hello :) My school just opened a charity foundation and they said we can donate money,food and stuff like that so i was thinking on using ads because i spend 70% of time time on tumblr lol so if anyone can tell me how does ads work?, how much money i gain with a click? i have 2 computers on my house so i can click... show more Hello :)
My school just opened a charity foundation and they said we can donate money,food and stuff like that so i was thinking on using ads because i spend 70% of time time on tumblr lol so if anyone can tell me how does ads work?, how much money i gain with a click? i have 2 computers on my house so i can click myself with my other computer? and how many times i can click myself?

thank you so much! it means a lot for me

ps:i have a job too but the ads would be an amazing help!
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