Good news Ivy is that the parts for this machine are still available ( IF you need any).
Dont be overly concerned with condition inside the machine, just make sure though if you do clean it, there are electrical components in there that dont like getting wet.
Fire it up once you have the correct power 15amp ( or can be run on 10amp with proper alterations by a sparky). Might be a good idea to get the sparky to quickly test before you throw it on.
A machine that has been dorment for over a year may problems such as blockages. Turn the main power switch right one click, see if the pump kicks in, if it does, give it a couple of mins to stop ( boiler may be empty). If it does stop, turn the power switch over another click to the right and give it 10 mins to heat up.
If it gets to pressure ( just between the blue and green area) that means its heating ok - just hope it cuts out. If it does stop heating when it should, press the start/stop button on both touchpads to see if they work.
I think it may be safe to assume something will be blocked/faulty. ultimately you may be better off getting it checked out. What area are you in?