Horticulture first, any bonsaiish comes after. Your tree needs to be outside, inside it will die. Now is the wrong time of the year to style a juniper in most of the world. So just spend time caring for it and give it a strong healthy new growth. If you acomplish that you can style in late winter or early spring. Meanwhile you can study the art of bonsai and your tree. Make up a plan how you want the tree too look in the future.
In order to make a tree look old the branches should have a big difference in size compared to the trunk. You can limit growth of a branch by thinning out its foliage or you can select thinner branches to grow on and remove bigger. Beauty is in the eye of the beholder, but I would strongy suggest not to remowe small branches and grow on thicker.
There should also be size difference between primary and secondary branches and between lower and higher branches. Its not fixed rules and it is your tree, you decide.
In order to make a tree look older in bonsai we want horizontal or slightly down facing branches.
Put all statements above together and you will see that all your suggestion above is totally opposite of normal bonsai technices. Again, it is no fixed rules and it is your tree. You decide what to do with it.
Now, put it outside and care for it, meanwhile read up on bonsai styling and make up your long term plan. Good luck.