Ah! I understand. Yes you need high speed internet to go start streaming. Depending on your area, you will select an ISP (Cox, AT&T, Comcast, etc). You will most likely get a router. Not sure if you are home now, but if you are, then most likely you have high speed Internet. Since you have a smart TV, there really is no point in buying a Fire stick. I would really recommend taking a glance at your TV's manual to see if you have Amazon prime. If so, then the Fire stick would be a waste.
If you do have internet service, you need to connect your TV to your local network. This varies by TV model, I would again refer to the manual for more information.