Please ask unrelated questions in separate threads.
"There is two ways" is entirely ungrammatical and I'm very surprised that you hear this from native speakers.
HOWEVER, the contracted form "There's" is often used before both singular and plural nouns in speech. The same person who would easily say "There's two ways we can go about this" would never say "There is two ways..." unless it was somethings like "This is... um... two ways..." where they changed the direction of their thought.
In writing, don't use this contracted form.
Student or Learner