I have regularly researched getting into 3d printing. Then realise the gulf between what you need as an entry level vs what I want once experienced. In other words, scope creep.
On this model, is the pro offering any extra value?
And what else should I buy as a newbie, so I can print from day one?
The Adventurer Lite doesn't have a camera, nor filament detection,
The Pro has a glass bed rather than a flexible carbon fibre bed. So 'stickability' for the start of a print may need a bit more tinkering, also removing the finished print from the bed will be different. Obviously you can't bend the glass bed - but it should be more durable. However a replacement flexible bed is only £15 from Amazon.
The Pro also allows you to print in a wider range of materials than the standard or Lite, but I don't see that being an issue for a new starter. I have only ever printed in PLA or PLA+ so far.
You wouldn't need anything else to start printing straight out of the box, as you get a half kilo of sample filament - but I'd buy a couple of rolls of filament in different colours to get you started.
It comes with a 0.4mm nozzle - more than versatile enough for the vast majority of prints. I have also bought a 0.3mm and 0.6mm nozzle to experiment with.
I also bought a wallpaper scraper to help remove stubborn prints, but have never actually needed it.
Some sand paper or sanding sticks will help get a perfect finish - especially when removing supports.
Likewise I've just ordered a dental pick (2.99 from Amazon) to remove supports from tricky areas.
I did buy some rollers so I could use larger spools of filament (cheaper to buy and less need for changing) but I've since found an adaptor specifically for the Flashforge (FOC on Thingiverse) which you print yourself from the initial 0.5kg spool.
There are literally 10s of thousands of free models to download and print yourself. The biggest mistake I think people make is thinking that they can print anything they imagine. The hardest thing is designing the item in CAD first.