Greetings PRAHL, don't stress it mate, many of us have been 'there' with our first oscilloscope 'exciting' adventures
...going south
If it's a brand new oscilloscope with a manual, chances are high you would get it going quite soon,
but with a used unit it can be a different story and a bit of a gamble for the newbie to get it going,
especially if any of the controls are sticky, dry, worn out in spots, crusty corroded connectors, suspect cables and probes,
and too many controls in extreme positions including pullout Mag knobs and Hold Off positions, so the unit won't trigger and or produce any trace.
At least you have a trace!
I would suggest try to get some audio/music/radio signal into input 1 then input 2 with some cable scrap or adapter and start playing with ALL the controls
till you get a music/audio waveform jumping all over the screen, regardless of AC or DC selection
The manual will give you a clue how to get there, but keep your attention on the Trigger Modes and what they do, and keep going back to them,
because those are the main items to understand IMHO, otherwise the oscilloscope has no clue what you want to 'see' on that screen
Good Luck and cool oscilloscope