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.

Forget satoshis, start with at least 0.01 Bitcoins. that will at least be substantial to invest and incur significant returns. Also, important thing, DO NOT invest more than you can afford to lose. Always invest as much that will not affect you when you lose it as then when you do earn it the profit limit is the sky in that case.