I couldn't really remember the first trip with my family when I was little, but I did remember the first time I went on the plane, how excited I literally was. That was the only moment that I couldn't really wait for any longer, I swear. I am sure you would feel the same.
Basically, every one has different travel styles. You might fancy travelling alone, with friends, or even by joining a tour as a big group. You might enjoy staying at the hostel, meeting lots of people from all over the world. Or you would prefer a safer option, staying in a fancy hotel with a lovely balcony in it. These are the initial things that we might think about when they first come to our minds.
But the thing is, what are the reasons why you travel? I love travelling because I could experience things that I couldn't while I was staying home...
Research! Research! Research!
So the first thing I would like to talk about is to do research before you travel. This is very essential and I am not even kidding. And by research, I mean everything, from the bus timetables, to the business hours, literally everything about the trip, I myself am a very bad example of not doing research (enough) before going to Venice two years ago... I went to a small island Burano for a lace museum on a Monday and I was literally running there because I thought I wouldn't be able to go there before their closing time. And at the end, I realised it was closed when I got there, not because I missed it, but... the museum is closed every Monday... So if you don't want to ruin your trip by ending up like this, you should do some research, at least. to check if the attractions you are going to will be open or not.
Carry as Less Stuff as You Can
I am not sure if you like shopping or not, but still, that'd be better if you could carry as less stuff as you could because most of the hostels, or even Airbnb do not really have lifts! Imagine carrying a super heavy luggage from the airport to the accommodation you will be staying at, and climbing all the steps to the 8th floor... that's actually happened to me, and I was so glad that my luggage wasn't really that full and heavy, but I'd be more appreciated if there would be no next time.
Wear Waterproof Clothing and Comfortable Shoes
Wearing a pair of comfortable shoes is extremely important for travellers. You should expect that you will be walking all day long, I'd say a pair of trainers will do. At least you would feel less tired after a long day. And for the clothing part, I would say that you should find something that is waterproof or water-resistant in case of raining.
Better Go without a DSLR Camera
I'd actually recommend to have a DSLR camera for your trip if a DSLR isn't that heavy. I used to take my Canon 600D for travel but I realised it was a disaster because my neck was nearly numb after a long exhausting day. I suggest that you could use a smaller digital camera instead, unless you are going to take photographs of (For example) Northern Lights or stars, otherwise, a normal digital camera can do almost anything. To keep your images best quality, you will only need to save them as RAW file, and everything should be the same!
I hope this helps. Enjoy your trip! Good luck!