It depends on the notes and condition, but Mike is correct. Don't get too discouraged, it happens. I have collected coins since the 1960's and only recently started collecting paper currency, and I did not know what I was doing or if I was paying too much. Other than lots of reading and research, I found YouTube videos helpfull. I have capture my experiences in videos (https://www.youtube.com/channel/UC1p0ClhhRD1eI8W4IbB8NZw), and I still purchased a few that I probably would not buy now. I only started collecting paper money a few months ago, so not many videos.