Ok, then next question on gas. How to get it? I've tried placing collectors near gas, and tried right clicking with bottles. Never seem to actually get gas.
Piping isn't easy, and doing it wrong might cause bad things to happen! What you generally want to do is use a gas collector to collect the gas and put it into pipes. However, a gas collector cannot pump a gas longer than 15 blocks. If you want to pump it longer than 15 blocks, you have to use gas pumps. If every 16th block in your pipe line is a gas pump, it will be fully effective. If you somehow mess this up, things might go bad! If you want to pump or collect gases of specific types, you can right click a gas with a sampler, then right click with this sampler on the pump/collector.
You might want to store this gas somewhere. That's what you have tanks for. Right click a tank with a glass bottle will fill the bottle with the gas contained in the tank, or right click a tank with a gas bottle to fill the tank. These gas bottles can be used with lanterns to produce light for varying periods of time. Some gases last longer than other gases.
To use the gas for other purposes than lighting, try pumping it into a gas furnace. It has an unique temperature mechanic; Smelting an item will increase the furnace temperature, which in turn will cause items to smelt faster. Gas consumption remains the same no matter what the temperature is, meaning you can save gas by using a speedy warm furnace.