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In general, no one is all good or all bad. You must however play to 
your alignment. I have a few suggestions for making a more believable 
good/evil character without sacrificing your chosen alignment behavior.

No man or woman is perfectly good. Good alignment does not mean that 
you are perfect, make no mistakes, always kill evil, and help little 
old ladies across the Market Square. What it does mean is that you always 
TRY to do the right thing. Often the best RP comes from a good align 
character's crisis of conscious when trying to do good brings about a 
bad end. Crises of conscious allow characters to grow and to explore 
themselves and one another.

Good doesn't always attempt to right all evil through the extermination 
of evil. In real life people give to charities, volunteer to work with 
those who need it, etc...rather than directly fighting the evil that gave 
rise to the need for such things. In FK, a character who is not inclined
to the execution of all criminals might instead attempt to aid victims 
of crime, feed the hungry, or clothe the poor. This can lead to a greater 
depth of RP which will be more long running and aid in the development of 
your good aligned character, perhaps more than vigilantism. This being said,
some characters are designed to act violently against perceived evil. In 
doing so, be sure that your character will gain something from the RP, 
and those characters around the event as well. 

By the same token, Evil doesn't always steal and murder. Evil is 
frequently someone who can con good out of their money, food, and 
equipment. Evil is most frequently difficult to recognize until the 
dagger is being pulled from between a pair of ribs. Evil played well 
is subtle and cunning. Evil played badly is boorish, overbearing, and 
oftentimes too blatantly stupid to be evil. After all, would a man 
attack another man knowing that 50 people are standing within ear
shot.  Not if he were a smart man.

However, there is in the Forgotten Kingdoms evil of the most black 
variety. It is insidious and when it comes near it can make the skin of
both good and evil aligned characters crawl. This kind of evil is 
extremely rare, most usually it is very powerful. Frequently, it has 
no one it trusts or relies on, leaving it in the end vulnerable to a 
concerted effort on the part of good. If this is the kind of character 
you hope to create submit a background to the imms and ask their input.