It is tough to design a tree via photos, but here is what I think when I see the first image. Hopefully other people will chime in.
First, the branch at #1 is a big problem and has to go. You want your finished tree to have a nice taper, and branch #1 is too thick, as well as having a nasty knot and inverse taper close to the trunk. So branch #1 we're going to lop off. But wait! We don't want to cut it off flush with the trunk. Rather, we are going to jin it and solve the branch problem at the same time as not leaving a nasty scar behind.
Second, branch #2 is a sacrifice branch. It will not be used in the final design, but it is important now because it will make the trunk nice and thick. Additionally, when we are done we can either jin it (probably not) or cut it off flush with the trunk because the scar can be hidden on the back of the trunk. So for now, do not touch this branch AT ALL. Let it grow as fast as possible and get thick and bushy and long - the bigger it gets the fatter your trunk will get, down low where it will give you a nice tapered trunk.
Branch #3 and #4 are probably too thick for your final design, but for now don't cut them off. #3 is should be reduced in length by 50% and wired down to be a back branch. #4 should be reduced in length by 50% and wired down past the horizontal so that it hangs out to the right. Do not remove any small growth from around the base of either branch. Hopefully as you shorten these branches they will bud back strongly and you may exchange one of these new buds for the thick branch.
#5 is your apex. Your final tree you don't want much taller than where I marked the #5. So you will want to develop a new apex there. Your best bet is to shorten the #5 branch by 75% or so, and hope that it buds back down the trunk. Of course, do not remove ANY small growth that currently exists or pops after you cut back branches 3, 4 and 5.
Eventually, you may end up with a tree that sort of looks like the following virtual image. I agree with what Attila says in that you want to see what happens as you start pushing growth back - you may end up with a different solution based on what the tree tells you. It is important that while you are doing this work you do not constrain the roots. Either keep them in the current pot, or transplant into a bigger pot or into the ground for a couple of years. You want the tree as strong as possible and pushing lots of agressive growth until you decide on the final design.