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All of it free ? or we have to deposit something ? And one first need to be a curator to curate, right ?

No need to deposit anything, you just need to become an official TipU curator. I don´t know if they accept new curators right now, sometimes they do. Once you are a curator, you can start giving out the TipU votes. The more diverse your curation is (= you should spread the votes among as many different authors as possible), the more votes you can actually give out every day. And btw self curation of up to 10% of your total curation is allowed ;)

I barely do self curation, let me know, when they would accept new curators.

Ok I will. In the past, there used to be at least small rewards (mostly between 0.1 and 0.5 Hive per day) for us, the TipU curators, who manually go through other people´s posts, look for the good and undervalued ones and give the TipU votes to them. Those who delegate to TipU don´t have to do anything and they have a very decent passive income from their delegations. Us, curators, we work every day and get nothing for it so the occasional self votes that are allowed (only up to 10% of your total curation) is the only little reward we now have for our work. So yeah, I do that.