I will leave mechanics and technical stuff to others. You can do a few things that will lessen the impact of playing an unfamiliar course.
1. Play a variety of golf courses, different styles, standards, lengths and conditions. It’s a lot easier to score well on a course you play all the time. Playing different types of golf can help sharpen your skills.
2. Read a book by the guy who owns this golf website. Then use it to pick a plan for each hole and shot.
3. Don’t sweat the score, just enjoy playing golf somewhere different