Kero pretty much has it down pat, especially the charm part

To add on to Kero's post, I would like to share an actual
method that you may find handy.
Once you have a whole whackload of charms in your bank, you need to figure out what pouches you can make with what charms, at what level, and from there decided which pouches you will be able to make for the best exp. The chart that I used to get started was this one:
Below is a table showing you what pouches to make with charms for the best xp/hr and for the lowest gp/hr used and in the order of which to make them
You will also need to do some research to figure out what secondary ingredients you need for each type of pouch you want to make, how many of those you can make etc. and then buy that amount of secondaries on the GE accordingly.
Start with your golds and greens, and try to save your crimson & blue charms until you have nothing else left. The reason for this is that crimson charms are by far the best to train with throughout your summoning career, as great experience can be achieved at a whole range of different levels using crims, and blue charms give your probably the MOST experience if you save and wait until 90+ to use for high levelled pouches.
Buy a bunch of glories, duelling rings, or get your Ring of Kinship, and decided where you which location you want to teleport to to bank. Start by moving your house to Taverly, and set your teleport option to 'arrive AT the portal' rather than arrive inside the house. Bring a few hundred House teleport tabs inside your inventory, tons of shards (can be purchased in bulk on GE or from Pikkupstix), a stack of a few thousand empty pouches (the blank ones), and the stack of charms that you are going to start with. The rest of your inventory should be filled up with the SECONDARY ingredient that you need for your pouch.
For example -- If you were making dreadfowl pouches from 4-16 like it says on the chart, you would need:
- Shards
- Empty pouches
- Stack of gold charms
- House teleport tabs
- 24 raw chickens (the secondary ingredient)
Start by teleporting to house with the above setup ^. You will land in front of the portal in taverly, a very short running distance from Pikupstix's house. Run to his house, go down the ladder, and select the "Infuse pouch" option from the obelisk there. Right click, select "make all", watch the exp drop, then use your glory/duelling ring/Ring of Kinship to teleport directly to a bank. Bank the pouches, grab more secondaries and click your house tab to teleport back.
This process is extremely fast, and you can raise your level very, very quickly once you have amassed a great deal of charms. I hope that helps somewhat, I know how starting summoning can be sort of confusing but its quite easy once you get the hang of it
For any other information check this article on RS Wiki:
http://runescape.wikia.com/wiki/Summoning
or this is more of an actual guide with step by step instructions for both training summoning, and collecting charms. Taken off RS Wiki as well:
http://runescape.wikia.com/wiki/Summoning_training