You can find the build region of the country you want to build in on https://buildtheearth.net/join/visit#more. There will also be a link to their Discord Server there. The way to start building in a build region is different for every region, so it is better to ask in their Discord.
This differs per build region. Some build regions allow you to build everywhere, while others have a system where you are allowed to build more complicated buildings the more you build.
We have a Build The Earth Network (buildtheearth.net) that is a hub to connect to many build servers. However, not all build regions are connected to this hub, so for some regions you also have to connect to a separate IP.
There is no large master world. You can download small maps with finished areas from different regions on the BTE Patreon, which you access here: https://www.patreon.com/BuildTheEarth
No, Bedrock is not supported as it needs constantly updating and breaks quite often. So, use Java edition instead to connect to servers.
We do not support any form of illegal copies of the game. You need to have a premium Minecraft account to participate in Build The Earth.
No, that is not a problem. You will learn to better overtime. Don't be afraid to make mistakes, because we all do. You can always ask for feedback in #building-help and in your local build regions Discord Server.
The use of /tpll <longitude> <latitude> is essential to have every structure in the right place. OSM already loads in outlines, but these are usually way off. You can get the coordinates of a point by right clicking a point in Google Maps in satellite view and then copy coordinates. (Don't use regular view, because these points can also be off). In Google Earth you can get the coordinates by hovering with your mouse over a point and pressing ctrl + shift + C. We recommand you try the starter tutorial on bteuk.net to get a better idea. This helps you with learning the basics of how to make outlines.
The project will probably never be finished, because the world is way too big for that. We try to complete as much of the world as possible, but at the end of the day we just build for fun. You can view a estimate of all finished areas on https://buildtheearth.net/map/statistics.
Many popular places around the world have 3D data on Google Earth. Hover over the highest and lowest points with your mouse and then substract those numbers you see to get the right height for the building. If there is no 3D data, you can use reference points to determine the height of a building. For example, a floor is usually three meters high and a door usually two meters high. If there also isn't street view, you can look for other references on the internet.
No, not everywhere. However, some build regions use LiDAR data, which makes the loaded terrain accurate. Ask in your local build region Discord whether they have this.
We have made a guidebook on how you can terraform. It's best to read through this. As for WorldEdit, it's best to search a YouTube tutorial to get an idea of the basic commands.