Hi!
I too had a number of LPs and wanted to get them into my computer. The gent you talked with about needing to run the TT through an amp is correct in that the signal coming out of the phono cartridge is not equalized, and the amp will supply this internally. It is not necessary for making the signal louder. You'll need to acquire a stereo RCA jack to mini-plug cable at an electronics shop. The RCA plugs go into the output jacks of the amp and the stereo mini-plug goes in to the line-in jack of your sound card.
You then must run the volume control applet of Windows. You hit Options -> Properties, click on the choce for recording and specify line-in. You will now be able to record the signal in a .WAV file. I prefer to record the WAV file using the recording facility in Exact Audio Copy (aka EAC, primarily a CD audio ripper, available for download at http:\\
www.r3mix.net). Once the WAV is captured, I use EAC to process the file. By that I mean I first normalize the file, then trim the beginning and end of a song and clean up any obvious clicks or pops in the file using the built-in sound editor in EAC. When I'm satisfied with the recording I, save it as a WAV and close EAC. I then use RazorLame to encode the WAV to MP3 using the --r3mix parameter (the --r3mix switch gives the best compromise between file size and quality).
Best,
Stutz