If you’re a “noob” then I’d suggest not doing it at all. Footplanting looks really odd on the short little roblox characters, and it takes a lot of time to code. I can recommend two things to you, which is 2 joint 2 limb IK module (2 Joint 2 Limb Inverse Kinematics - #14 by Soliform) which I’ve made a couple of posts on. It is usually for hand IK but I was able to somewhat get it working with feet.
Another option is FABRIK, which is an IK method that works with any amount of joints and is really cool. However, I found it to be really difficult to get working and understand since the actual code examples aren’t very in depth. Nonetheless, I recommend you check it out! FABRIK (Inverse kinematics) - YouTube
Honestly, don’t even bother with IK unless its some huge major gameplay feature. And if it is, I’d recommend rethinking your game.