If you are up too it, get a waterstone, (norton 4000/8000 combo) is pretty much the standard. A strop is used to keep a razor sharp. A waterstone is to sharpen a razor.
You don't. Syringes are meant to be disposable. You should discard the old one safely in a hard-sided container so nobody gets stuck by it, and go buy more syringes.
Use the bottom of a porcelain dish.
yes by giving precise force on the razor by the rock can make it sharp
Strops are made of durable, flexible materials they are used to polish and sharpen the blade of a knife or a straight razor. They can also sharpen woodworking tools like chisels etc.
Use a match box and sharpen on the striker.
A razor strop is used to sharpen single blade razors, otherwise known as cut throat razors. The blade is passed against the strop multiple times to sharpen the blade.
Usually instead of sharpening the blades on an electric razor you can just replace them.
The straight razor.
rubbing it against a sharpening stone i think called pyrite (spelling) or leather
You can get a blade sharpener, but those alone can cost around twenty dollars.
Walmart carries many types of razor sets and they are well known for their straight razor sets. You should check out their website or find a store near you.
One may purchase a straight edge razor at Vintage Edge Razor. They supply blades, handles and complete kits. These are nice gifts for any man who prefers to use this style of razor.
One can learn to shave with a straight razor from online information websites sites such as Wikipedia. One can also view instructional videos on straight razor shaving through video sharing websites such as YouTube.
No, you cannot bring a straight razor in your air travel kit. You can bring an electric or a disposable razor.