What are the logistics of renting a limo?

The transportation will be from Ajax to City Hall in the city center, and then to a restaurant in North York. If I want a ride at the end of the evening, do I have to pay for all those hours spent dining? It's a wedding, but I hesitate to say that because we don't have a special budget for people to jack up their prices at the mere mention of "wedding." Is it better to book a limo at the restaurant, and then take an Uber home?
I've never rented a limo before, so I don't know what to look for.