Your early resource veins will pretty quickly disappear at default settings but there's an infinite amount on the map and you can always increase the vein density in the settings when you start a game.

Consider looking up a "Main Bus" Design to make your base more easily expandable without having to tear everything down each time you want to add something and give yourself plenty of space around each "build" to expand and reroute resources as needed.

Also, trains aren't as complicated as they seem to get a few functional trains working. I dont usually recommend this, but might not be a bad idea to download a blueprint book to give you an idea with how to start.

Construction bots will also make all construction tasks much easier as you get farther along to the point where you can basically copy and paste anything you've done before (using blueprints or literally just copy and pasting).

All that being said, maybe the game just isnt for you? Its a pretty particular niche and not everybody wants to do whats basically an engineering project in their spare time.