(Psst. You don't have to double-post, you can click the "modify" button at the top right of your post to edit it.)
As for the items, you can really have as many as you'd like. The problem is, in order for others to see them, they have to be in the same item order as yours. That way, you won't be wearing a necklace, and everyone else sees a bubble (for example).
So, I'd suggest using this item pack:
tinyurl.com/ItemPack2
The installation instructions should be in the download, and this one is fairly common, so most people will be able to see your items fairly well. I hope this helps!