If you're very brand new to sewing, I highly recommend finding a pattern for a tote bag, pillow, or something else very easy to start. Your local thrift shop is a great place to find fabric to start; I buy up nice bedsheets, tablecloths, and other large pieces of fabric and use that. I also recommend (after learning how to thread and use your machine) to learn how stitches work and feel by sewing on white copy paper, it's thick enough that you can sew on it for practice. If your sewing machine did not come with a manual,
this is a place to find the manuals to many machines, and the manual is very helpful if you don't know what you're doing. Also, hit up your local library and just find a book about sewing in general -
this book, as old as it is, is an extremely good resource for beginners to understand types of fabric, how patterns work, and basic sewing. Good luck!