I have lot of experiene with C, C++, JAva, Php and sql.
I just began to offer, trying to get my first job on freelance, and to get very good calification to begin. So you'll find someone who will put all his effort to achieve this.
I have a lot of experienced too, working with code written by other people
From your description it is difficult to know in advance the time the project will take. That it can be said after checking the code and knowing what exactly you need.