u only need the ir led and buttons, to make a remote but u have to know the code of each button of your tv and how many times it send to your tv, try to look for a library, there is sony and other brands library, or try to look for a project more complex leaving only the necessary parts.
for working remote u only need 1 ir led that can be attack to pin 13 thats already have a resistor and a way to tell arduino u are presing a buton