I'm 34. If you do all of the following, you can't possibly fuck up. If you do half, you're better than average.
By 30 you should already:
-Know how to dance
-Can pay for everything on at least the first three dates (can does not mean must)
-Know how to listen and restrain from giving advice
-Know what to do in bed
-Hold an interesting conversation
-Have an interesting life (travels, can play music, paint or write)
-Have two or three good friends who will be nice to any girl you present them
If you are really below average, go for the single mums, divorced girls or the ugly girls. They will fuck with you if you are not an absolute scumbag.
If you're not rich, handsome or interesting, do not expect to fuck rich, handsome or interesting girls. Remember that 80% of women think 50% are below average...