Hey welcome StaChan
Glad to have you here with us.
NESMaker is a great tool to create easily small games for the NES. And more advanced ones with (a lot of ) code.
You will find a lot of resource on the forum, scripts, tutorials, ideas,...
Feel feee to ask you have an issue and also share your projects.
First, don’t forget to follow all the tutorials (i suggest the « intermediate » and « advanced » )
Have fun!