You have to decide if you take a hip hop beats download you find on the net and use it for your rap song.
First many avenues and packages are available for you to find and download beats.
The problem however is that many of these beats are subject to royalty payments and any use of them can sometime be seen as copyright infringement.
Originality issues also exist.
Do you simply use a hip hop beats download file without knowing the history.
Consider how many times that beat has been used by other rap artist, then place yourself in the position of a listener.
The first thing a listener will hear will be the beat.
This is even before your vocals begin.
Imaging if that same beat has already been used by several other rap artist.
Listeners often would be inclined to turn your song off for lack of originality.
A hip hop beats download may not match your vocal style and delivery.
You must consider the tempo of the beat and the tempo of your delivery.
A downloaded beat may also not have match your style for the entire beat length and the chorus loops may not be to your liking.
When you produce your own Beats you can adjust the beat tempo and the instrumental inclusions.
You can loop a beat to use as a chorus and adjust volume setting of the individual instruments.
A hip hop beats download provider usually do not allow for changes to be made in the file as they are not the producers of the beats.
I definitely recommend producing the beats yourself.
The lyrics to your song may require that you create a number of different beats before you find the right mix.
With a hip hop beasts download you get one file per purchase in many cases so if that beat doesn't match more money is required for another beat.
More than enough information is available on the internet to help you choose a high quality producer.