I'm guessing it's Absolute Airsoft you are talking about, they have a bad reputation. I know quite a few people who have played there and they've not gone back. They are also partnered with a "shop" that is fairly well known as the biggest scammer in the country(Special Airsoft Supplies)
If you want to buy some kit before going I'd suggest you limit yourself to getting some basics like trousers, shirt, face protection and some boots. As much as it seems like a chore it is worth hiring before you buy and most players will be happy to talk to you about their kit so you get an idea of what might suit you.