Firestick and Chromecast should handle the WiFi, although I don't have those so I can't say with confidence.
Our 2 TVs both have WiFi, and they both have Hulu and Netflix apps. So we just turn on the TV, select the Hulu app, and then select "Live TV". I would expect the Firestick and Chromecast would also have those apps.
Yeah, we were paying $230 or so for Cable TV with DVR , Phone and Internet. We dropped the TV and Phone, now are just $85 per month for internet. $45 for Hulu Live TV. $15 or so for Netflix. Also, on Black Friday last year Hulu offered their Hulu service for $1/month for a year, so we have that too for now. But we've pretty well watched what we want off the Hulu and Netflux services, so don't know if we will keep them much longer.