Training a 2 year old

Question
I have a 2 year old gelding. He's was my first foal, and I've been the only one training him. When he's tied, he sometimes pulls back. How can I teach him not to do that? Also, he's skittish around new people. He's been out at my farm since he was born, so he doesn't see a lot of people. He's perfectly comfortable around me, but he doesn't like being around new people. Is there any way to make him more comfortable other than just bringing people he doesn't know around him? I'm also thinking about trying to get a saddle on him soon. He still has a lot of growing left to do, so I won't be ridding him yet, but I want to go ahead and start lunging him with the saddle. He already seems cautious of it when I put it on my other horses. Is there a good way to get him to accept the saddle?

Answer
Part of the pulling back is normal with a horse, as they test boundaries.

You can stand behind him, out of kicking range of course, with a pop can that has some pebbles in it, and when he comes back, rattle the can, stopping IMMEDIATELY the moment he steps up.

Or can brush broom on ground too.

It also will help if the horse leads well, and gives to pressure from you walking him around, as well as working with him moving over hindquarters and forequarters.

Are you babying/soothing with this horse any?  That will cause one to be skittish about things, even horses that have years of training can be made to be complete idiots by those things.

The more matter of fact you are around him, the better he will behave.  Make sure he is well mannered, and when others are around that they are well behaved around your horses.

What breed is he?  Some breeds are more reactive naturally, and are more alert to things.

Before saddling him, you need to make sure he will stand for girth area pressure, which you can familiarize him with by placing lead rope around barrel, and tightening it and loosening it with your hands, not by tying it tight, just get horse used to that sensation.  Do this from both sides too.

He also needs to be used to pad/blanket being placed on him, and removed.

Rub blanket up and down mane and back, and remove and replace it over and over.  Let horse smell it for short time, but not excessively, as that creates a "monster" in horse's eyes, as they dwell on it too much.

Let horse smell saddle, and then place on back, and remove.  Do this over and over.  Do not let horse buck off either one, but remove them yourself.  

Before cinching up, I would have someone there to help you of course.