Hi, sorry for forgetting to reply.
I was meaning that If I change the letters so was "styling" or making it diferent from bitcoin ones, nevermind it, ill keep them from bitcoin, i guess it doesnt matter
Keep them the same yeah. The only downside is that the users of your altcoin can't distinguish the addresses of bitcoin and yours. Again, leave that for later, build your altcoin first.
Could youplease tell me how I am supposed to test the coin if I did not managed to finish it? I mean, before building it i guess
You can't test the coin without building the binaries.
I was meaning to edit them
Yes you can edit them, but it's not required. The only thing that it is required to change for your altcoin to not be considered bitcoin is the pchMessageStart values. These define if you're following bitcoin's chain or not.