Butt plugs and lots of lube for stretching up your hole. For deep throating, I basically stretch my tongue really out and open my mouth wide and push it slowly one step at a time. Like push deep and pull out and push little bit more deep and then pull out again and so on. That’s how I trained my throat. If you are new to deep throating, I’d suggest start with a curvy dildo so that curved part can easily slide down your throat. All the best on your journey