Within my country, I have three regions, region 1, region 2, and region 3, I was wondering if someone can help me delete those regions and help me make new ones within my country. I am open to all suggestions and help

I have a few questions in making my country look better.

How do I make exits (off of motorways) appear with numbers? How can I make a trade route to other countries without breaking the rules? How can I make a bridge across a river to another country without breaking the rules?

I am open to all answers and they will be put into consideration.