You will just drop them off the needle. What you're doing is creating elongated stitches. When you knit one, then do two yarn overs, you're actually making one long stitch on the needle. Next round, you'll knit the knit stitches and drop those wraps (YOs) off. What you're left with is a long, beautiful knit stitch.
A word of warning, the first elongated stitch (after the YO round) will be a little wonky in shape. Don't let it stress you out. It's normal.
And when joining the round, all you do is knit into the first stitch of the round with the working yarn, which is coming from the last stitch. Knitting that first stitch joins the round. Just keep knitting around and around.