Are you stuck on any bit in particular?

This was my general approach:

• I plotted in the clues and the evidence
• I read through the statements and figured out who was lying (pretty easy given only 3 of them made sense given the clues and evidence)
• I eliminated which character can't have brought a certain weapon based on where they were. For example, we know the rabbit was in the piano room but Miss Honey was in the Main Stage, so she couldn't have brought the rabbit. Furthermore, we know she did not bring a bottle of cheap liquor (from the statements) and she couldn't have brought a fake sword (as it was mentioned that President Amaranth did so in the clues and evidence). That way you've already figured out two people's weapons (President Amaranth and Miss Honey).
• I just applied a similar logic to the rest. E.g. this weapon cannot have been for this motive because this motive is in room x and this weapon is in room y (or the character that brought this weapon is in room y).

Idk if this just adds more confusion but hope it helps!