If you mean how many bottons on the collar, then this all depends on what look you like and how you are going to wear said shirt. I think 2 bottons (high) collar is very nice especially if you like the slim fit style. There are also 3 botton (high) collar versions and this goes down fine with many - its all up to ones personal taste, and also very importantly ones pysical shape (high collars do not look good with a low-neck person IMO). To answer your question (as Jovan allready has) the classic standard in this case is 1 botton collar
If indeed you meant how many bottons on cuff, well there again it depends on what youa re after - I prefer the higher cuff thus 2 bottons placed vertically , or even 3 botton cuff on some styles.
Bottom line is there are no rules when it comes to fashion (well, with some minor exceptions) - its a matter of personal taste (sometimes age has alot to do with it), personal character, and the ability to wear something with good taste and style