to compare a file I use the file of a member who posted it I found the maps added in ida but I can't find the code to call it it's map in the rom so I don't understand the path to do it and I don't want to use a file that someone has made because it didn't interest for me I would like to learn.

It takes probably half a year to start getting somewhere with RE.
It takes years to get good.
It takes decades to become great.

If you need a tutorial on such basic shit as loading a binary into IDA and are unable to figure it out yourself (btw even this has been posted on this forum!), then this is not for you.
Because RE is purely about banging your head against the wall persistently and figuring things out.

So stop now. Go do something you are good at, make money, and use that money to pay someone who is good at RE.

Then you take the c166 instruction set manual and study it for half a year, and google. Nobody can help you if you dont have the thinking for it.