As far as spells and magic go, you could go the [url=http://www.d20srd.org/]d20 D&D 3.5[/url] or the [url=http://www.d20pfsrd.com/]Pathfinder[/url] route, for references and ideas.

[url=http://dndtools.eu/]This here[/url] is another good reference site for the D&D 3.5 system.