I suggest you start working on your English first before offering any copywriting services. The grammar of your post isn't very promising.
That is probably the main reason that he does not have a portfolio, does not have any experience and is willing to work for free for the clients to see if they like his work or not.
With a lot of competition in every field of work, this is not the right approach for the OP to get any work or assignment. He needs to build his portfolio in order to stand out among the competition.