Also, I'm nervous on how I take my BDSM toys across the border (i.e, flogger, crop, pet-play tail and ears, butt plugs...) without possibly getting odd looks at security? Not to mention how I bring my ABDL items across the border? (i.e, my binky, sippies)
If you are meeting for the first time IRL, are you absolutely sure about taking such items with you? It is entirely your call, but personally speaking, I would be stashing the BDSM items for a later date. Kink can wait. I think it's far more important to get comfortable with each other in person first. But again, your call, Foxette.
As far as your ABDL things go, just pop them into your hold bag. Don't feel nervous about them. Nobody will blink twice. A binky and some sippy cups are innocuous items. They may mean something to you, but to anyone else, they're just bits of plastic. No need to fret about them
On that note, have you ever met a LDR partner in real life after a few or several months online ? Was it easier and less awkward than you imagined? How did you manage to overcome some of the anxiety of meeting for the first time?
You do everything you possibly can to keep yourself safe. Keep your friends and family in the know. Give them details of your flights (inbound and outbound) so they know when to expect you home. You should call to let them know you've landed safely and check in daily. Give them details of where you will be staying. Also give them Siniwit's full name, address and contact information. Always make sure people on your side of the pond (people who only have your best interests at heart) have everything they need to keep you safe and touch base with you at all times.
I would personally be making my own way to the hotel, rather than jumping in a car with a man I met on the internet.
I would personally be making sure I had my own hotel room, not staying in a shared room with a man I met on the internet (not sure if this is the case for you guys). I would also be keeping the key to said hotel room safely in my own hands at all times.
I would personally keep things like money, my passport and travel documents in the hotel safe, keeping the key or security number for said (locked) safe to myself. I would not allow a man I met on the internet access to these things at any point in time.
Like Dulci said above, meet in neutral, public places where there are lots of other people milling about. Get yourself to and from these places so that you can leave at any point - look up local bus/train times, etc. and always have them to hand.
I don't say any of the points above as anything other than basic safeguarding considerations. None of these things are being said as a 'slight against character'. The fact is you will be in a country you don't know and ... you are only 19. <worries> Don't put yourself in a position of reliance or vulnerability. You need to be in complete control of your personal safety. Do you have anybody in the UK, apart from your Daddy, you can touch base with? Anyone in the UK you can call if anything goes wrong, or if you need help and advice? If you have any forum friends on here, it might be an idea to swap numbers with one or two who are close-ish to where you will be staying. You can work out a coded 'HELP' message between you should you find yourself in a pickle at any point.
It might be an idea to discuss the possibility of shelving the power exchange dynamic between you for a first meeting. Take the pressure off saying/doing the wrong things initially by just enjoying your time together as a couple and getting to know one another in person. Some people do this, others don't. It boils down to what you are both comfortable with.
I'm sure you will have the most amazing time together, but ... don't let excitement cloud your judgement. Take the necessary steps to keeping yourself safe. Always. You can never be too safe. You can, however, be too sorry. I wish you both the best of luck!