For more experienced traders (or at least some experience) there. Which would be the minimum to invest in order to have a chance to profit from trading? I would like to start as low has 10k satoshis, but as I have seen, many exchanges have minimums and minimums fees and that does not feel reasonable.
Let's say that we put a goal to earn 20k satoshis a day (on average) from trading... How much would you see you have to employ to achieve that?
You like trading with alt-coin ?

My advice you can start with higher amount like 0.01
BTC or higher and your goal 0.02
BTC a day.

Because 10k satoshis is to low to start trading and it is easier to lose.

I agree. Start with a significant amount of at least 0.01 BTC so you can at least have a more significant profit after the fees. Trading in satoshis will not be advisable as the time/resource factor will mean a less remarkable ROI.