I seems that the linked post your provide by @IamSam
provides an excellent outline of all the steps needed to proceed with your project. I am unable to spend the time to create in minute detail all of the steps required for the project your are pursuing. After doing all the work it may not provided all the information you need to complete your project. Other forum members may be able to jump in yet I will proposed several paths you can take that I think will balance that amount a forum member can contribute and possibly better aid you in your learning of Photoshop (The objective of this forum is more along the lines of helping in a request an not doing the request.
Here are the paths for you to consider.
1) Follow along in the step by steps @IamSam
has already provided in the link and if you run into trouble, then document where you got stuck and ask for help with a particular problem. This may take some time as you are learning yet it will be easier and faster for a forum member to respond to specific questions.
2) If the root issue for you is lack of understanding of a particular part of Photoshop, ask for references on how to learn those features of Photoshop which are giving you trouble.
3) If you cannot devote the time to become more skilled in Photoshop, you can make a request on the "Free Photoshop Requests Forum" to do the work.
4) If your request is too complex to do, you could also make a request on the "Paid Photoshop Requests Forum" at a nominal cost.
Those would be my recommendations on how to proceed and other forum members may have other suggestions as well.
Hope these suggestions are helpful