Hey Michaël. I'm new here too. I'm from the UK and I've never been to BM before. You sound like a really cool person and I wanted to say hello and share a few things I've picked up which hopefully might help.
1) Check the baggage allowance on your flight. You may be able to being a tent with you. Tents weigh a lot less than I thought. You'd have to pack the tent poles in your checked baggage though, they're not allowed in hand luggage.
2) I was worried about how I'd pack all my food and everything...then some helpful person on the BM Facebook group pointed out to me that there is a huge Walmart in Reno, which I believe is the nearest city. So I plan to pack SOME things before I leave and get the rest once I am there. This may sound obvious to others but for me figuring out this little bit of logistics made me feel I had a much better handle on things.
3) If you want to have a bike with you in the desert, there are several cycle places where you can book a bike for the event. There's one called Black Rock City Cycles. If you google it will come up.
4)THE INTERNET IS YOUR FRIEND. I've even been using it to look up what types of food Walmart sells so I can figure out what are the equivalents to the things I'm used to eating.
5) There is a ride share board on here which I believe opens closet to the festival. So you can arrange to meet up with someone and travel from the city you are flying into, out into the desert. That's what I am going to need to do too.
6) Going to BM, particularly as an international participant, is bound to be expensive. The tickets are expensive, the flights are expensive. You'll need a tent and camping gear unless you already have it. Food and water for seven days. A first aid kit. Protective gear like goggles and dust masks. MEDICAL INSURANCE (very very important!) also you need a plan for contingencies. It's very unlikely, but what if something happened that meant you needed to fly home early? I'm just trying to help you think of everything. These are the things that I am planning for, and the last one is why I figure I need a thousand pounds spare, JUST IN CASE. I am borrowing money to go. But what I've realised these last few weeks is...if you're serious about doing something, you will find a way. And I hope you find a way because you seem like a cool person.
7) Use these boards, they're a gold mine of information from people who have been there and know what it's really like. There's a search bar at the top on the right.
Plan to take the environment at BM very seriously indeed. I mean this is coming from one who has never been before...but some of the dangers include heatstroke, dehydration, altitude sickness and skin problems caused by the dust which is apparently slightly caustic?! I figure that the more I know about how to prevent these problems the better chance I have of enjoying my time there. No-one wants to pay seven hundred pounds for a flight and then spend seven days sick out there!
Whew, look at me pretending like I actually know what I'm talking about