Hi, Thrillerlover. (I love a good thriller, too.) I'm pleased to meet you, and I'm not trying to be unwelcoming when I explain why this request is not reasonable.
You're new, yet you've arrived with a big old GIMME sign. You want our time and expertise and don't mention whether you're willing to give back your own. We've seen new members just like you too often. They're not bad people, but they arrive with their hands out, get what they want, and disappear, never giving any of their own efforts back to the individual beta readers or to the community as a whole.
This rankles. We'd prefer people didn't seek to use us. Now I'm sure you didn't come here with the overt intent of taking without giving, but since we've seen so very many people do that, you'll understand our reluctance to give yet again.
Instead of asking for us to help you first thing, how about you interact here, especially by posting at the boards for the genre in which you write and by giving critique at the Share Your Work board for any genre you read? This will go a long way toward showing us you're not a fly-by-night user but someone who let enthusiasm take the reins for a minute, there.
Maryn, repeating she's glad to meet you