The so-called "boosts" don't give you actual experience; they temporarily increase (boost) your level in the selected skill. In that case, yes, there are items that temporarily boost your LEVEL.
No.
Just search for 'Runescape item ID database' and you'll find multiple services to search for item ID's.
There is no NPC, place, or item in RuneScape called "Kela."
As far as I know, no F2P item can do that. I'm not sure about P2P but it is highly unlikely without Prayer or other bonuses.
No.
bronze dagger
Wiki Answers will not provide the information to break the rules of RuneScape.
On runescape there are no code to get item
Yes
It was a 2008 Thanksgiving item, filling it with the required item got the emote, Turkey.
nothing
You use pestle and mortar on your item.