First off, welcome! I didn't get into the cosplay/costuming scene until I was 17, and the resources at the time were so much more restricted.
Now I am assuming you are planning to use Eva foam? Given your templates. And that your templates are printed from the pepakura program.
As Blazing Forge noted, keep using the pepakura viewer to finalize assembly, as that will really help you out!
Outside of that, make sure that your scaling is tested before you get too far into assembly.
Further, if you haven't already, check out the tutorial index and see if there is something in there that may help in your process:
Tutorial Index This index is a gateway to a wealth of knowledge shared by community members here at the 405th. Each of the tutorials below was created by a community member who wanted to share their own expert tips, strategies, and creative solutions with all of you! This index is updated...
www.405th.com
Lastly, don't aim for perfection on your first go around. build what you can, how you can, with what you can. You will get better and gain skill over time. Things will wear down, break, or just not fit. Rather, a part of the hobby. But always know that you can make a new part or piece. My suit has gone through entire generations of parts since I completed it in 2012.
View attachment 370724View attachment 370723View attachment 370725View attachment 370722
Have fun, engage in the process, and feel free to share any progress.
Looking forward to following your build!