You can find lots of potty training episodes of kids tv series. We liked the Daniel Tiger one, there’s a Bing one, whatever he likes there’s probably an episode about it! We have a Hey Duggee potty training book so again, see if there are books that he’d relate to. Sticker charts seem to work quite well too.
My son isn't a book type of boy. But the TV shows you have mentioned I could definitely try
What toilet/potty did you both have? I've seen the fisher price 3 in 1. Not sure if it's ideal or just a gimmick
We have a carry potty for out and about and a pourty one for at home. Honestly I wouldn’t spend a lot of money and try and move on to using the toilet as soon as possible as it’s less clean up!
Flash cards of the toilet/potty pants etc. Have you got any books that you have read to him? If you have keep reading them, take him to the toilet when you go, ask him foes he want to sit on it, even with his clothes on, lots of praise even if he hasn't done anything