I'm obviously a bit biased, but I'd highly recommend my YouTube channel, Moof University, as a free resource to help you learn biochemistry, just as allantois and elevatone did. I cover nearly everything from the basics on Acids and Bases all the way to (and through) Replication, Transcription, and Translation. I, of course, also have videos on metabolism of all the macromolecules (carbs, lipids, proteins, nucleic acids). Check out the YouTube channel, and if you want a suggested viewing order, check out my the video links on my website; it's easier to scroll through what I've got there. If you've got any questions, ask away! Cheers! :]