Lots of talking, lots of books. Go ahead and start researching homeschooling now. You have lots of time to figure out what philosophy fits you the best (and you may change your mind some time down the line) - Classical, Scholastic, Charlotte Mason, Unschooling, Eclectic…
Work on instilling good habits and virtue in the toddler-preschool years. In “A Catholic Homeschool Treasury” by Wittman and Mack, a homeschooling mother described the most important tasks of preschool as working on obedience, orderliness, and honesty. These are foundational to the the tasks of living well in a home and family, and also education.
Get some books and start getting in the mood about it. The one I mentioned is good. I also liked “Designing Your Own Classical Curriculum” and “The Well Trained Mind.” The last one isn’t Catholic, but has a very well thought out perspective. Books on the other philosophies can also be really helpful. Don’t feel like you need to read these books right away - BUT consider that when you are in the thick of homeschooling, you won’t have as much time to ponder all of the decisions, and you might not have as much energy to do a lot of extra reading. I read these books before my oldest was school aged, and I’m glad I did, because I’d never get to them now.
Some homeschoolers do formal preschool at home, others don’t. Often, homeschoolers will do preschool with their older kids, but not with the younger ones when they don’t have the time. The younger ones aren’t missing out terribly because they have the benefit of tagging along with the structure and activities of their older siblings. There are several good programs out there, some of which require more work from the parent than others. Focus on keeping the preschool years fun, and not pushing the child too early.
Speaking of pushing the child too early, a common mistake that homeschoolers make is to see their child make quick progress early on, and push them to do too much too soon. Sometimes this results in burnout or backfire a year or two down the line. It is hard to be patient, but it is important to remember the benefits on not moving too fast. There will always be time for lots of math, and there will be a time when it can’t be avoided. But there won’t always be time for playing outside all day long and enjoying the carefree life of a young child.
Maybe you are still in the stage of deciding whether or not to homeschool - if so, and if the ideas above overwhelm you, then ignore them. Just pray about this decision, and if you have the opportunity, talk to homeschooling parents and ask them questions about it. God bless!