... do you have pictures of the parts you want to make? Drawings? And...not to forget the most important thing a NDA (non-discloser agreement). Yes you can
possibley do what you want to do for 50K. You can also put yourself out of business by buying the wrong equipment.
That is part of what I do, on a larger scale for one of the major defense contractors. I have set up a number of small turn-key shops for smaller companies when I had my own business, and it is very hard to answer your questions without seeing what parts you want to make, how many at a time, and what you predict your growth to be in the near future.
Don't just show them to anyone and the ones you do, have them sign a NDA. Consider that you may need to protect your designs.
Steve