First Tip, buy a good mask, with good ventilation and a thermal lens. Being able to see is a game changer, no matter how long you've been playing.
I think a second hand Tippmann A5 is the perfect beginner marker, but not everyone wants to buy 2nd hand as a gift. The built in feed system means that a paintball is ready every time you pull the trigger. That's a bigger deal than you might think, especially for a beginner.
Tippmann's entry level Cronus is based on the venerable M98C, its cheap and a very reliable design. Not as nice, or as fast as the A5, but it will get the job done.
There are other ways to go. https://www.youtube.com/watch?v=vjwhL41Do40
A UK dealer for Tippmann. https://www.bzpaintball.co.uk/paintb...paintball-guns