It all depends on what information you’re looking for, but Google scholar can be very helpful once you learn to navigate around the paid journals.
If you go to a college or university, the online library will have access to many articles and they can order the ones that are not immediately available… and for free! Yay, free!
I also have the distinct advantage of being a biomedical major and chemistry minor. I have taken intense and involved anatomy classes and a rather frighteningly in depth endocrinology course. Not to mention the cancer research I’ve done for Chemistry and the histology research I am doing now. Those things I’ve learned are undoubtedly available outside the classroom, but I haven’t really bothered to go and search for information I already have. You could always pick up some bio books. I highly recommend “Biology” by Campbell and Reece, published by Pearson. I have the 8th edition, but I’m sure you can find the 7th (or even the 6th) on eBay for super cheap and it will be just as good. It’s very well written and easy to follow.
I think it really helps when you’re are interested in the details of how things work at a molecular and microscopic level. Once you understand it at that point, it’s a lot easier to build the bigger picture. Knowing the building blocks is like having the picture of the finished puzzle to go along with the pieces… you know what you’re building.
I think learning to distinguish your questions is important too. You need to know what you’re asking in order to find a good answer.