Hi
Welcome to the forum.
Airsoft is quite easy to get started with. Find a site near where you live, either by seachng the forum or google, or say which town/city you live in and people can make recommendations.
Book a skirmish with a rental gun.
Turn up and play!
Follow the marshall's advice at the breifing.
You don't have to invest in anything beforehand, but I was glad i got my own ey/face pro, boots and gloves beforehand. Typically rental eyepro is mesh. Good pair of boots with ankle support is a good idea, and BBs sting especially on the fingers.
Search the forum, lots of opinions on what to get.
Wait until you qualify for Ukara before buying a gun.
Will give you time to see what is around, maybe hold a few at skirmishes. Same for camo, have a look at what others wear before diving in, some like to follow the crowd and others like something more unique.
Cheers
G