Toddler bed transition (from co-sleeping)

I’m sure there have been other posts about this but I’m not sure how to search. My son and I currently co-sleep, But I am 7 1/2 weeks pregnant and really need to start getting him to sleep independently. We usually lay with him on a big mattress in his room until he’s asleep and then i’ll join when I’m ready to go to bed. Does anyone have any tips for transitioning from cosleeping to a toddler bed? I know it’s going to be rough at first. I plan on still staying in his room with him at first until he’s asleep. Thank you!