Brazilian Science Illustration

Hello!  I'm from Brazil. I am a biology student, and I love Science Illustration,but where I live don't have any course aboute this,and I don't know how I start. My campus also doens't have anybody who can teach me. I'd like to know if you can help me and give me some advice, like which books( cheaper books) I can use, or if there is some blog or site. Thanks, and sorry about my terrible english, I hope get better!