Customer database

I operate a tanning salon. Right now, customer sessions are tracked on a 5x8 card. One side has name, address....the other side has columns to enter date, unit number (which tanning unit used), #of minutes in unit, salon associates initials. Ex: 5/20 6 10 MLT Once the information is written on the customer card, we also list it on a separate daily log. Information includes customer name, unit number, Dollar amount of any purchase, type of payment...cash, credit card, check, gift card. Ex: May 20, 2013 Mary Taylor 6 $44 Cash Susan Jones. 4 Janet Smitten 3 $66 credit card If that could be combined great, but if we had to make a double entry I could live with that. I just want to get rid of the cards and make life easier and more efficient. Other software does way too much. Thank you.