USA Manufacturing help

Hello all, I’m looking to have some custom metal aglets , zipper pulls and eyelets prototyped for production. I currently have the CAD and STL files. I’m looking at making my product here in the USA and could use some help with what direction I should go in for the manufacturing of these metal pieces. CNC vs Sheet metal? Also, which metal would be ideal for my application? They will be for the finishings in my swimwear line. Quantities would be in the low 1000’s. I will pay for prototype and for helping point me in the right direction that leads to a physical prototype.