Networking is essential when considering graduate studies. I met my research advisor at an informal chemistry meet-up in Brass Taps two years prior to working for him. You'll never know when opportunities present themselves, so it's important to take chances and meet everyone you can.
I would advise a prospective graduate student to do their homework before contacting prospective advisors. Check out their profile on the University website, read their most recent paper, and even reach out to a senior graduate student currently in the lab!
Explore as many different topics and opportunities as you can, talk to lots of different people (who are interested in the same things, and different things!), and don't be afraid to ask for help to find the resources and supports that will help you succeed in what you want to do. When you're choosing an advisor, make sure that they will be able to provide you with the support and mentorship that you want and need, and that you are on the same page about academic and work expectations.
Sometimes as an undergrad it's easy to stay 'behind the scenes' and just go to classes and complete what's required of you. But grad school has SO much to offer, and there are opportunities to gain new experiences around every corner that contribute to both personal growth and look great on a CV. I think getting involved is so important, and creating new relationships with faculty/other students is key.
Professors at the University of Guelph are exemplary in their professional acumen. Over and above this, there are plenty of opportunities, like Teaching Assistantship (GTA) and Research Assistantship (RA), for an international graduate student to help fund their studies.
My best advice for prospective grad students would be to not be afraid to put yourself out there to the individuals you want to work with or those you believe to be the best sources of information. You are your best advocate! I would suggest doing as much research as possible on different graduate programs at various institutions, as well as the research being conducted to find the best fit for yourself. In my experience, asking current grad students how their experience was and how they achieved their goals was extremely helpful as they provided their authentic opinion.