Become a merchant to anyone of the merchant service providers and integrate their API to your website, if you have a serious business with your website. Some are coinpayments, gocoin, bitpay.

If you're implementing a wordpress blog, then you can use woocommerce wordpress plugin which easily adds bitcoin as payment and also more payment options.

And simply you just include your bitcoin address, if you're directly communicating with the visitors or buyers of your site.