Please help
You should start with viewing Halo 5 Forge tutorials (search that on YouTube). Getting Olive isn’t just about making a Forge map. It’s making a Forge map that is good enough to make it into normal matchmaking.
It would also help for you to describe specifically what kind of help you are looking for. Need help with a particular feature? Looking to make a specific item? Need inspiration for getting started? Just asking for “help” isn’t very helpful; after all, it’s not like you’re just looking for someone to build a Forge map for you, right?
making a map is an art and a science that takes practice and time it is insulting how many people think they can just throw something together and expect it to work you cant just draw one painting and have it be a Mona Lisa. Keep practicing and I bet you will get it. I dont mean this to be rude.