Then you should only quote jobs that you know how to price
Like it was suggested, the contractors here don't like to divulge pricing information for free over the internet to strangers. USE the search function for the question you've asked and you'll see what people have been trying to tell you in a NICE way. Dig in your heels and get rude and you'll get nothing more than smarta$$ answers here.
Now, as to your pricing question;
Go to a lumber yard, ask how much it costs for the materials you need (if you have any carpentry skills at all you should be able to figure that out yourself) and then double that price for your quote. Hopefully, you'll be able to make your mortgage payment with what's left over.
One other free bit of advice for you, try to sell your potential customers anything else BUT Trex as it's pure crap.