It's normal to be nervous about this personal info thing and getting screened, etc.
Yes, providers do ask for that info when the guy has no history in the hobby ie. provider references, written reviews, white lists, posting history on this site or belongs to a verification service that can assure the provider you are not a cop, or unsavory character.
Yes, many guys give that info many do not.
Do spend some time reading here to get familiar and comfortable with how this works.
Check the link below for info from the Self-Help Center. Additionally the Self-Help Center can be found on the upper right of most discussion boards. It (the link) is directly under the red and white life preserver. It has a lot of info about how to make contact with a provider and what to expect. It has a section that specifically answers your question and so much more. The link below is one section of the Self-Help Center. Specifically read #1, #2, #3 they refer to references, personal info and so on.
If you can PM me feel free to do so.
I recommend getting the VIP membership. It gives you complete access to all that TER has so you can be informed and enjoy.