Given a travel related situation, and given a specific question about the situation, summarize the question into a title

[EX Q]: I am travelling from London Heathrow Underground to Norwich, UK on the 18th of June 2017. For this purpose, I purchased tickets via trainline.com and these were delivered to the USA (perhaps it was a bad idea, but its done now!).

I am confused as to how to use these tickets/this ticket. The folks at Trainline.com were unable to help me via telephone. I noticed that when I use Trainline's route service, this was returned:

So the ticket(s) I have:

Where do I use them? At London Heathrow underground or elsewhere?
Should I get other tickets for the tube journey between Heathrow underground to Liverpool street station?
Related: Where exactly is Heathrow underground with relation to terminal 2?

Please do let me know if I can improve this question in any fashion.

[EX A]: How to use purchased train tickets for London Heathrow Underground to Norwich

[EX Q]: I think it's better if I tell a short example:

I plan on going from country A to country B, and I find out that it is cheaper if I pass by country X.
However, the flights from A to X and then from X to B have to be booked separately with unrelated airlines 1 and 2.

Is it usually possible to ask airline 1 to automatically transfer my luggage on arrival to city X, to the plane managed by airline 2?

Or do I have to grab my luggage myself and go through customs and airport-security?

[EX A]: Luggage transfer between unrelated airlines

[EX Q]: I'm in Colorado at the moment, more specifically at Boulder and I want to know what places I should visit while I'm here. I want to go to the Denver Museum of Nature but besides that I don't know any other fun places to go to. I'm not that much of a "sporty" person so going to the mountains although beautiful and enchanting is not really for me.

Edit:

I enjoy most things related with science or with music, so that would probably be what I want to see. Oh and I enjoy all sorts of bizarre things. Even spooky things!

[EX A]:
Places to visit in Denver