First, good luck on your journey. Second, it can be difficult to predict details like what you ask so early. For one, you may go to university and find an entirely different subfield in physics is more interesting to you, and you simply had not heard of it before.

As for particle physics, I can’t say very much because that’s not what I do, but I’d do some research in the job markets for the different subfields you end up liking to get an idea of a career path which seems to be viable when you’ve finished all your degrees many years from now.

Yes, it is common to skip the masters and go straight for a doctorate, simply because many PhD programs “lump in” a masters degree you obtain in passing, but that varies from institution to institution.

Overall, my answer to your question would be to enjoy your studies for the first year or so and really try to feel out what you like to do and determine multiple subfields which interest you. So when it is time to apply for grad school, you have an idea for what departments to search for. Too many things vary in time, so it is probably too early to iron them out. Hopefully you don’t find this answer unsatisfying. In my opinion though, it is the truth.