Low-level flying — It's all fun and games till someone looses an engine. (Paraphrased from a YouTube video) Improving the Dassault Mirage F1 (Wiki, Forum, GitLab. Work in slow progress) Some YouTube videos
Easiest? Tick the Terrasync box, and let FG download scenery automatically as needed. Note that in 2.8 you may need to create a new scenery folder where FG expects to find one.