Re: New player looking for some help.
Welcome! And I dunno what version of D&D you're looking to get into, or what rulebooks you may or may not have, so I'll just mention the
Hypertext d20 SRD website, which has more or less all of the open-game-content from 3.5 Revised Dungeons & Dragons.
It excludes a handful of iconic monsters and a few basic rules and tables from the PHB and DMG (and excludes most non-rules material), due to those few bits being held by Wizards of the Coast as part of D&D's Product Identity or whatever instead of open content (and thus not legally reprintable by others). The SRD includes most rules material from the 3.5 Player's Handbook, Dungeon Master's Guide, Monster Manual, Unearthed Arcana, Deities & Demigods, and the Expanded Psionics Handbook, and I think a little bit from the Manual of the Planes but not much.
Most core-rules material for 3rd Edition D&D (aka 3.0) is available at the
http://www.opengamingfoundation.org/ website.
4th Edition D&D has more-restricted rules access, AFAIK, requiring that you buy the books or pay for a DDI online-library subscription at the Wizards of the Coast website.