My Doctors have told me to drink a lot of water to help keep my system flushed out. I once had a serious problem with my lymphatic system and had to see a specialist. His diagnosis was there wasn't enough liquid in my body to keep things flowing. Like you, I was going long periods without peeing. His diagnosis fixed that.
Keep your system healthy and drink enough liquids to pee 6 or more times a day to keep things moving inside you.
Yes, my urine smelled way different after starting hormones. It lost that harsh (male) smell.
Enjoy all the other changes, too. You're truly a girl now.