Here are some steps you can follow when buying a toilet:

1. Consider the size of your bathroom and the space available for the toilet.
2. Decide on the type of toilet you want. There are two types of toilets: one-piece and two-piece toilets.
3. Choose the bowl shape that best suits your needs. There are two types of bowl shapes: round and elongated.
4. Determine the height of the toilet bowl that is most comfortable for you.
5. Decide on the flushing system you want. There are two types of flushing systems: gravity-fed and pressure-assisted.
6. Choose a toilet with a water-saving feature to save water and reduce your water bill.
7. Look for a toilet with a warranty.

I hope this helps! Let me know if you have any other questions or if there's anything else I can help you with.

[Here](https://www.homedepot.ca/en/home/ideas-how-to/bath/how-to-choose-a-toilet.html) is a link to a more detailed guide on how to choose a toilet from Home Depot Canada that you might find helpful.