Well, you've learned the Secret of Knitting: there's always more you can learn about it. A couple of good reference books can help.
In the "tons of information" category:
1. Vogue Knitting
2. Knitter's Handbook by Montse Stanley (30 ways to cast on!)
These two are the gold standard for all-around knitting information. IMHO, indispensible.
Also very useful:
The Big Book of Knitting by Katharina Buss
The Knitting Experience by Sally Melville (3 softcover books)
Knitting in Plain English by Maggie Righetti
Specifically for finishing: The Knitter's Book of Finishing Techniques, by Nancie Wiseman
For beginning to design your own --
Knitter's Handy Book of Patterns by Ann Budd
Knitter's Handy Book of Sweater Patterns, by Ann Budd
These give you basic techniques for everything from hats to cardigans, and do the math for you so you can use any yarn you like, and knit at your own gauge.