PW are usually anywhere between 45-48* (although sometimes you will find PW's as low as 43*, 44* and as high as 49*).
Gap wedges are usually around 50*, 51*, 52*, 53*, and sometimes 54*. But this doesnt mean you couldnt use the 53 or 54 as a strong sandwedge (alot of players use a 54*SW).
Sand wedges are between 53*, 54*, 55*, 56*, 57* 58*, 59* and 60* (58* 59 and 60* depends on the bounce angle).
Lob wedges are 58*, 59*, 60*, 61*, 62*, 63*, and 64* and can be identified with a low bounce angle (ie, 60/4 or 60/6, etc).
As a beginner, I would suggest carrying a driver, 5 wood, a couple of hybrids to replace your 3,4,5,6 irons as they tend to be a little difficult to hit consistently, 7,8,9,PW, 52* GW, and a 58* SW/LW (10* or 12* bounce), and a putter.
This configuration would suit a beginner well and you always add in your mid and long irons as you get better and take out your hybrids.