I have done a lot of flying and I only seen something called unidentified object.
Also you have to be below 30km to drop it off FSD correct?
30km is the minimum speed. Anything below 1Mm/s will drop you as soon as you hit the button, regardless of where you are. Anything above that will prompt with an "are you sure?". Hitting the button a second time will
rip you out of supercruise, overheat your FSD, and probably damage your ship.
To drop out right where you want, wait until you see the "Safe to exit FSD", or whatever the hell it says, prompt. It works on
anything that you can target. Again, it's just like exiting at a station...
everything is just like exiting at a station.
As for your Sidewinder, it's the shittiest ship in the game. I wouldn't even waste my credits upgrading it, just buy something better as soon as you can afford it. While boring, trading is still the best way to simply make money. Buy a Hauler. Unless you're dead set on fighting, in which case buy an Eagle until you can afford a Viper.
Remember you're in this game for the long haul. It's going to take a while to get up to where you want to be. I only just tonight finally got upgraded to "Mostly Harmless".. lol. And my Cobra's probably worth about half a million credits. And I'm still a long way off from buying my Type-6, much less upgrading
that.. that'll probably be close to two million before I'm done. And I don't even want to think about how much my Asp will cost... that's a ship I plan to keep long term, so it'll be
fully upgraded in every category.