Unfortuantly you are a Human in Space Engineers, you know, those things made of water that need oxygen... Anyways, to survive in Space Engineers you need two things, both are equally important, oxygen and Uranium. They are both pretty simple to get. For Uranium you simply have to mine it and refine it. (For some reason, the planet famous for such Uranium related inventions as: nuclear power, the Tsar Bomba, and literally every object every made with uranium; Earth, does not have any.) To find it you just pull out your hand drill and fly around asteroids until you stumble upon a shiny black substance labled Uranium, if you find a shiny black substance labeled cheesecake you probably should report it to the developers. Now onto the slightly harder one, oxygen, that thing that isn't in great abundance in space. For oxygen you need three things; an oxygen generator, ice, and oxygen bottles. On any easy start you should have an oxygen generator and oxygen bottles already. So how do you get the third thing, ice? To get ice you fly around asteroids until you find a blue substance labeled ice with your hand drill. This should be enough to prevent your character from dropping dead, but there is still one more thing you will need if you want to maintain status quo.

Your jetpack, you know, the thing that lets you fly around asteroids, requires Hydrogen as fuel. Hydrogen is really simple, all you need is an oxygen generator, ice, and Hydrogen tanks. If you have all those things all you do is put the Hydrogen tanks in the oxygen generator, then you put ice in and it fills the tanks.

So now you won't drop dead due to lack of power or oxygen and you can continue to fly around with your jetpack. So you may ask, "Now what do I do??" Well lucky for you I have the answer, turn on that big imaginitive brain of your's and start building! Whether you build an asteroid eating drill battleship-megacarrier or a mach capable d*ldo, just have fun with whatever it is you build! No one will judge.... oh wait, it's the internet, everyone will judge. If you come across anyone who judges, just slap them with a big, flying, floppy piece of pure imagination!