I've only used an electric razor to shave, and i don't grow facial hair that much because I am still young.However, I have decided to start shaving with a straight razor and need some feedback.

1. Should I shave with a straight razor even though i don't grow that much facial hair?
2. I have researched a little on straight razors and i found that there are ones with disposable blades and ones without. Which one should i buy?
3. Which razor is good for extremely beginner like me? I read that dovo are pretty good, and on another forum that i should buy a 5/8th width razor.
4. Should i buy razors on amazon.com?(With the below $20 razors)
5. Do i have to sharpen both disposable blades and non disposable blades?

I understand that some of these questions are very basic, but i am just new to the whole shaving thing. I appreciate you're responses and may have other questions in the future.