http://www.youtube.com/watch?v=FiiTOMf41P4 is a good summoning guide, I used it to get 62 pretty fast. Skip to 5:58 to get to the part where it shows which charms to use at certain levels.
A good way to train would be:
1. Inventory setup: Alot of pouches, alot of shards, alot of charms, same amount of secondary items as charms (noted). + some gold in your pouch
2. Go to the summoning shop in taverly and sell 50-100 of the secondary items to the shop at a time, then buy them back to unnote them.
3. Create the pouches that you brought the items for, then make scrolls outof the pouches to max xp.
4. Buy back some of the secondary items you sold to the shop from earlier and repeat