(dumb question) How Do I Make a Check Point That Works? [Even most free modeled never worked!]

Yup, I really don't want a trash free modeled check point for me and my friend's game. My friend tried her own but it didn't work! So we need help for our Escape School Obby! I need a check point really badly because we currently have a free modeled check point, so I need help not making me and my friend look like a noob! Please help! :C It'll make my day! <3 I tried Check Points for my other obby me + sister is making and we couldn't make it! Roblox is amazing, but my games are trash, so I need help ASAP! Check Points are really hard. Anyways, even most of the free models don't even WORK!

EDIT IN 2020!: hey this was a dumb question, i should've actually looked somewhere other than the free models section as well, or i was just really blind lol.