I would encourage all prospective graduate students to research their program of interest and speak directly to faculty prior to applying as this can ensure that your research goals align with your prospective advisor/program of choice.
A right step taken at a right time completely changes your identity. I won't say that your academic journey will be easy, but I am sure it will be worthy.
Always ask for help. When in doubt, ask; When not in doubt, ask. Enrolment in graduate courses can be very small, and grad life can sometimes feel isolating; so, try to form great bonds with other grad students. You have a lot in common! Try to take some time off to have fun, and when you inevitably encounter students pulling a tractor in September, do the opposite of what I did; and be cool! If you can, participate in the 3-minute thesis competition (3MT); it's a lot of fun!
To any undergraduate student that wants to pursue graduate school, my best advice would be to study hard, celebrate your academic victories, and don't get caught up on your failures. Everybody has a story of a course they wish they did better in, or a midterm/exam that was an unexpected curveball, but as long as you learn from your past and keep pushing forward, things will work out for the better.
To future graduate students, it is important to keep a clean, legible, and logical lab notebook! Also remember that your brain is your best weapon to succeed in graduate school and it functions best when it is well-rested; only pull all-nighters if necessary. Learn to manage your time and try not to do multiple things at once; multi-tasking in the lab can lead to errors in experiments. Finally, enjoy your time and get all the food and freebies from conferences and other events!
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!