My optimal goal is completing every quest, so if anyone can provide a list of required levels for EVERY quest to help me get RS gold them done, I'd be thankful. The Santa hats right now are more than 70 mil (but they were missing a few last time I checked) That means you have an excellent bank. I can sum up summoning effectively for you, I think.
Summoning is basically a skill that allows you to create a familiar (acts as a cat does and follows your movements) for a specific period of time. Each familiar has a distinct feature. Some fight, others heal you, some help hold things to provide greater inventory space, and so on. To make a familiar appear you will require a pouch. A pouch basically makes an image that is familiar (for only a short period of time, as explained above).
To make a pouch, you need charms. The process of making pouches can be described as where a majority of experience comes in summoning. Charms can be obtained by killing monsters (slaying is one of the best methods of obtaining charms). Additionally, you'll require blank pouches, shards, and buy OSRS gold a secondary ingredient. Pouches and shards are bought from the man you created Wolf Whistle with in Taverly. To figure out the secondary ingredient is required, go to the summoning manual and consider the kind of pouch you're making.