Lots of hotglue plenty of replacement blades. Like TurboCharizard stated start on something small and simple then slowly work your way up, one suggestion is to check out DFT on Youtube and check out his foam builds. EVAkura is another great foam armor smith. Be sure to take your time there will be times when nothing seems to fit together correctly or scaling is giving you trouble just take a break and come back to it. There are some really amazing foam builds here, take a look through them and kinda make note of what thickness of foam is used, tips and tricks that they use to help them with their builds. One thing that Helped me get some really 45 degree angle cuts was a neat little blue tool that was bought on amazon.