[Gally]

1, 4 + 5) Look up resource guarding and start playing a trade up game with him. First you will teach him the "drop it" and "leave it" commands and then start trading low value items for higher value items. Giving up an item voluntarily should always be rewarded with something better. Start the training with something he doesn't like too much so you set him up for success.
http://www.youtube.com/watch?v=pEeS2dPpPtA&feature=plcp
http://www.youtube.com/watch?v=7My9gMIEyiE&feature=plcp
http://www.youtube.com/watch?v=hInjqMSOYgs

2) Practice focus with him so you can more easily keep his attention and get it back when you lose it. Most dogs will be distracted by various things though so if you can't trust your dog it is best to keep them on a leash or a long line if there is any chance they might run off.
http://www.youtube.com/watch?v=eiMGJBxRtBw&feature=relmfu
http://www.youtube.com/watch?v=aTSuPk2Ccjo&feature=fvwrel

3) Jumping up can be self rewarding so it is important that when he is doing what you want (greeting calmly and with four feet on the floor) that you reward him. You need to make dong the behavior you want more rewarding than the behavior he wants to do.
http://www.youtube.com/watch?v=lC_OKgQFgzw

I've included links to kikopup's youtube channel with relevant videos.