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 do not see any advantages for staring with higher amount. When a trader trades for a goal on daily basis. He will feel the pressure for making profits. So, we must need trade for with out any short term targets. Calm mind can make good trades. Starting with minimum investment can guarantee a calm mind set.
Yes, don't force it. When you force trades, you will make mistakes and lose money.
When I used to trade, I started with 1 BTC. That was an OK amount for me and even if the exchange went bust, I would live with it. This is something you need to be aware of. When you trade, you leave coins on the exchange. That means that if someone hacks the exchange, your coins are probably gone. Just another risk of trading.
Than go with the flow. Don't force. What you make daily with this 1 BTC you make!