You should have some small treats on hand, be in a quiet place, and train your dog for 10 to 15 minutes at a time. If you train for longer than that, your dog will get bored. Remember to give him lots of praise and treats when he does something right, but don't get him too excited, or he will lose focus.
To get your dog to give you his paw, first get him to sit. Then, as you say the word "paw," take his paw in your hand and give it a treat. Do this a few times. After the first few times, don't take his paw so quickly. Instead, say the word, count to one, and then take it. He should raise his paw as you say the word. If he doesn't, go back to saying it at the same time and do it a few more times. Once they've done it twice or three times, most dogs are good at it.
In this case, the paw trick led to the high five, which is a development of a lot of other tricks. You should hold a treat in your hand and raise it a little higher than you would for the paw trick. Because you taught him earlier, your dog will think you want to do the paw trick and will reach for the treat with his paw. When he does, you say "high five" and give him the treat. Once your dog knows how to do the paw trick, this one should be very simple for him to learn. After just a few practice sessions, he'll be able to do it with a hand signal instead of your voice.
You can get your dog to jump through a hoop. Before you start, please be careful not to hold the hoop too high, because you don't want your dog to hurt himself while doing the trick. Sit your dog on one side of a hoola hoop. On the other side of the hoop, hold out a treat and tell the dog to come out of the seat. At first, he may try to go around or under the hoop; if this happens, start over. Your dog wants the treat and will quickly learn that going around or under it won't get it, so he will start going through it. When he does, say "hoopla" and give him the treat. Soon, he'll be able to jump through the hoops when the hoopla sounds. My dog, a Labrador, is a medium size, so I started with the hoop 6 inches off the ground and slowly raised it to waist height. If you have a smaller dog, you might want to start with the hoop touching the ground so the dog can just go through it and then slowly raise it as he gets used to the trick.