FIRST!
ooh, a tough one
congratulations. LE is the hardest d&d scheme to play (no, not absolute neutral, as that is bull and in general not possible), imho & those of my friends
maybe it'll help to think about the two parts of the alignment seperately, and what they mean to both you and the character, and THEN what they mean when put together
what is lawful? - i think that's rather easy, as the definition is quite clear, i suppose
what is evil? - that's the tricky part. at least if you do not translate "evil" with "being a dickhead" (the latter isn't evil, it's stupid. for refernece: see all the really cool villains in books or movies or plays or...; i do not think the cool villains are those who eff around "just 'cause")
what are the goals of the character?
what are chraracter traits/values/moral ideas he follows/holds dear and why?
[maybe add some more questions here]
and when you can answer all of the above seperately, throw the answers into a nice big bowl and stir it until properly mixed, and then you'll know what the character would do in certain given situations.
if you aren't sure, why don't go through some situations (which should have more than just two options, and if only two then please not those plain choices we have to see in newer bioware games (KotOr, MEffect, DA)) in your head and think about what you see as the most probable and characteristic reaction of the character
p.s.: if the above, in parts or as a whole, doesn't make much sense, please forgive me, as i worked all night and i am tired and hungry and english ain't my native language and thus i might not be able to express what i mean in exactly the way i actually want ^^