I'll be back tomorrow to answer questions, but know most of your questions can be answered online. Just below your letter are buttons to accept or decline your offer. If you accept, you will see a button to let you pay your tuition deposit online (it's an e-check system...you type in the numbers on the bottom of your check or use certain kinds of credit cards). I believe orientation registration will open after April 1st, but I will verify that and post about it next week.
You have until May 1st to make your decision about whether you'll come to UVa or not. If you decide to go elsewhere at some point in the coming weeks, I hope you'll decline the offer immediately via your self-service page. That will allow us to move to the waitlist more quickly.
Again, congratulations! We are so lucky to have you considering UVa!