I want to fly from UK to Toronto then travel to New York City,can i get an airline ticket that allows me to fly to Toronto then back home from NYC or would i have to return to Toronto to fly back ?
If you're spending time in New York may I suggest you take a look at the 'New York Greeter' website.
For a small admin fee you can get a bespoke guided tour of NY. When we booked we had a guide from 09:00-17:15, yes we bought him lunch and drinks, and in return we had a guided tour of the city, and a running commentary, and all for an admin fee of $25. He also gave us tips on where to go and what to see during the rest of our visit.
If you use Expedia to book, click on flights, then click on multiple destinations, then you input eg London to Toronto, and NY to London. Will you be getting the train or bus from Toronto to NY?