"I think i explained bad." yup, but to be fair maybe english isn't your native tongue.
"I' d like to fly as PIC," Okay, get that bit.
"i don't hold my cessna," As in you don't have the type on your licence ??.
"eventually with a safety pilot or not," So your thinking of getting the rating ??.
"as for a C172. 10 , 20 hours.
are there some operators doing that?" so, are you suggesting that what your actually looking for is an operator who will allow you to fly for them for approx. 10-20 hours, with one of their staff acting as a safety pilot in order to allow you to then move to the left seat on your own chosen aircraft ?.