There are something need to check and consider:

1.  License from your government. Usually, this business need some licenses;

2.  Local advertising market research. Make clear how is the market there.

3.  Choose a good location. Traffic hurry place with traffic lights nearby or some else places which can see the estimate screen clearly

4.  Make a budget：

1) Shipping and import cost: check the shipping cost to your location and the import tax. If you have no import right there, find an import agency to help you.

2) Steel structure: Usually, LED Billboard supplier will offer you a guiding steel structure drawing shows how the screen installation and connected to the steel structure.

3) Installation cost: find local installation company to help you install the screen and connect cables.

4) Maintenance cost: Maybe you need a tech guy to help you running and maintenance the LED Billboard.

    5.Find good and reliable LED screen supplier, suggest from China, the performance and price ratio is good. They will give you suggestions of the screen size, product, power consumption, brightness, weight, etc. 

   6.Clear ROI. According to your market research, you can find how much you will earn from this business.

   7.Buy the screen and running it.