I'm new and need help

I dont know anything about home theater system except I need and AVR and some speakers and can connect them with either hdmi, optical, or rca cables to my tv. Im on a budget so my plan is to buy a used old avr and some bookshelf speakers for the time being and upgrade over time... I have seen a yamaha htr 5830 within my price range and was thinking to go with that and connect my tv with an optical cable.

I can really use some help and would appreciate any tips or suggestions. Thanks.