This is a resource to help you type out pronunciations in english. It also includes the international phonetic alphabet, but I’m not entirely sure how helpful that will be. I tried to find guides for a few different languages, but I didn’t have a lot of luck, so if anyone can find some guides for pronunciation of languages besides english, maybe you could post the links here?
Also, this page will tell you the keyboard codes for special characters that you don’t necessarily have keys for (this one is specific to computers running Windows, I believe)