Howdy,Paz---You are going to have to do this one the hard way--and the only way---
Get some drawings done---talk to your building department to find out what's needed.
Then make a few calls to a concrete company or two---they will need your plans.
Then go to your local old time lumber yard and ask for the name of a skilled,reliable framer.
A guess from any one of us would not help much--to many variables.---Mike---
