I'm making a mammoth rider and I have a few questions.
How does my huge mount affect my characters ability to attack? Can I only use ranged attacks or would a reach weapon be sufficient? Are people without a ranged weapon or reach unable to attack my character?
Although it doesn't make sense, once you are mounted, you can attack any 5ft square adjacent to your mount. If you also have 10 ft reach, your attack can hit 10 ft of your mounts square(s).
You share all squares with your mount, so you can attack any adjacent target. You would provoke from adjacent characters if you make a ranged attack. You would have normal 10 ft reach if you used a reach weapon. All adjacent characters can attack you if they can attack your mount.