I noticed you have a wizard guide. Should you be contemplating sorceror instead, enjoy Solo's Stupendously Superior Sorceror Stratagems.
Should you decide to try summoning, if the book would be allowed (I notice you said core only) enjoy Treantmonk's guide to the Malconvoker.
Even if you can't play one, it has and links to great advice for all summoners.
Above all, have fun!