From: Vermont, USA
1) What must you research, discover, or explore to be allowed to start researching Warp Bubble?
Build explorers, explore your system thoroughly.
2) Why did my constructor run out of resourse building a Gas Mining station when there was plenty at my Spaceport it left from and it had plenty of cargo space? I unfortunately did not check if it was full when it left, but it should have been.
If you saw a shortage message, it may be temporary. If you have stock of the missing resources in your spaceport, a freighter should pick some up and head to the constructor so that it can continue.
3) What should be built as the #1, #2, and #3 priorities starting off as an empire in pre-warp era?
Some may prefer a different order, but for me it's, Medium or Large Space Port, Energy Research Station, 2 Explorer Ships, Construction Ship as the top four.