paypal how many of u use it

i always had trouble using this paypal yrs ago so i quit


but after alot of my customers asking me to open one for trade i finally decided ok will give it a shot just waiting for some info.

how the **** does it work, how much does paypal take aff u when u sell something and do they pay the money into your business account or your paypal account

and if they do pay it into your paypal account how much do they charge if u ask them to put it into your bank account instead

cheers