Did you you have previous game making experience? I've toyed with the idea of trying to make it a small project for me and my kids but I thought it might be a bit beyond them (and then ultimately become just my project)
my advice is to just start building something. the Toolbox has thousands of 3D models which make the initial experience easier and more fun, and there are hundreds of YouTube tutorials teaching you the basics of Roblox scripting.
also use the excellent DevForum, which has thousands of explainer posts:
https://devforum.roblox.com/c/resources/community-tutorials/...