Should I get a very expensive set of bogu as a beginner, because more money means more protective?
Not necessarily. Some more expensive bogu protect better, some are lighter and thinner for competition. So long as you buy an adequate set, you will be fine and in a few years you will have a better idea of what you want in the high-end. I hope you will be practicing for a few years and upgrade, but if you are in the majority and are not, at least you will not have spent a lot of money. However, if you have the money and really want it, go for it.
