Maybe playing PC game NWN (Neverwinter Nights) could help, here the alignment system is 100 based, where 50 is neutral (I think I have copied it subconsciously), and depending on actions, the game (GM) adds or substract points.
In D&D the alignment is important for some professions (paladin, ranger, etc.), fortunately in RM this is not really important, channleing users don't need to worry while they follow their deity path (independent of alignement), and all others simply have no problem of any type.
I repeat that there are only 2 points: 'alignment confrontation' with magical items and detection spells. So this could not be very important.
So, your characters should choose their initial CPs (usually 40-60 for neutral), and then the gameplay can modify them.
For example:
- aid someone by a reward modify nothing.
- aid someone for no reward substracts you CPs, depending on risks, so if the adventure is dificult and players don't desist, you could subtract 15-20 CPs perfectly. If there is really deadly danger, GM could substract 30 CPs (this can be change neutral-to-good alignment).
- If you do an action that favor you and make little damage to others (that other one lose money but his life is not in danger) you can add 2-5 CPs.
- If you intentionally kill (direct or indirect) anyone for your own profit GM can adds you 30 CPs.
All this is subjective, so only gameplay can aid you to adjust it to your personal view of alignment.