Hello Sofi,
Well done, I do like the 'space man' there were two old ladies in North Wales who saw a couple of silvery figures by the roadside, just reminded me of that.
As soon as I saw it I thought, Thelma and Louise'.
I found that once I'd learned the tools they became a minor concern and my major concern was actually finding stuff and putting it together. What I did was to go around and take pics of anything that caught my eye, even on a walk to the shops, lots of textures at my feet, found an old clock that someone had trodden on last week looked really good.
You've already got the imagination, follow your instincts and do what you like the most.
Cheers