There are so many ways to pursue your passions and interests. I'd recommend that prospective grad students be certain that they are ready for the rigour and commitment required by graduate studies. Be open to new ideas, critiques, and other ways of seeing the world. Learn from your peers, students, university staff, and the wider community, in addition to your professors. Be generous with others and build community. Don't forget where you come from.
I recommend taking the time to thoroughly research potential graduate programs and supervisors to find one that is a great fit. It is important to work with a supervisor whose interests align with your own, as passion for your research will help you succeed in academia, especially when things get tough! If you are passionate about reproductive health and fertility, I wholeheartedly recommend the MBS program.
I advise prospective grad students to network with as many interesting people as possible. Networking is key to finding research opportunities and gaining experiences. Even simple conversations can stimulate new ideas or help solidify original ones.
I am a proud second-generation Gryphon and University of Guelph alumna, having received an Honours Bachelor of Arts in International Development from the U of G in 2008, following in my father's footsteps (Agricultural Engineering '71 and MSc '86). Coming back to Guelph to pursue a doctorate has felt like coming home in all the best ways.
While it's true that you should work hard to reach your goal, burnout is real. Allow yourself to take breaks when needed; take a nap, play video games, and laugh at some memes. Life will feel less annoying.
Workshops offered through the library and OpenEd are so beneficial to help with your research goals and teaching tips/tricks. Definitely be sure to check these out!
Although I think most prospective grad students have been told about the importance of picking a study/project that interests you, I think it's also really important to take some time to see how you interact with your supervisor and lab. These will be the people you work the closest with for the next several years, and help provide support to you in some of your toughest moments.