Nothing to get super excited about, chewing on the brush is the best part! LOL I started really young so my kids would get used to the toothbrush so this wasn't really too big of an issue, although when my son wanted to knaw on the brush, I'd tell him, "Mommy is going to get all the sugar bugs first, then it is your turn" I'd let him have his turn/chew on the brush while I finished getting his jammies on. You will want to be the one doing the actually cleaning until age 5 or so, so get in the habit of doing the first sweep, then let him "finish". Stay consistent (brush morning and night if you can) and it will become easy. With both of mine, I'd say, OK, time to brush your teeth to remove the sugar bugs! I would either sing the A,B,C's two times or mention all the things he/she ate that day, OK, we had mac and cheese, let's get the sugar bugs, oh, is that a piece of carrot I see in there? Let's get it... and so on!
In regards to flossing: once the teeth are touching, you'll want to floss. Start this early too, even if it is just a quick little sweep. Getting him used to it now will not only make it easier when you have to do all teeth but will set him up to have great dental habits!
M.