+1 to what Omahan said. Ladies who don't screen are low hangin fruit for LE.
99% of agencies don't give references. So, my opinion would be not to start with an agency.
P411 is a good way to get started. There are always different ways to screen a newbie. You just have to find a lady who is newbie friendly and willing to go the extra mile to get you screened.
My suggestion to you is this......Find the type of lady you wish to see, read the reviews on her and then give her a call or email and ask if she's newbie friendly.