buying bitcoin and holding it is the safest possible bitcoin related investment. the only risk is the price that may go down. but if you hold it for the long term then it is a solid investment.
It is not a bad thing to invest in Bitcoin today but of you are serious about making money with Bitcoin you should buy more then one Bitcoin.
I am sure that if you buy only one now that you will regret it.
Correct! You must set a plan and not just a plan nor short term goal. You must set your goal into long term goal.
Buying bitcoins today will benefit you in the next few months or even years. The longer you will invest into bitcoins. Then profit will come to you at the end of this year or two.