New Shoes and...Triathlon?

Helloooo!! The weather has been awesome and the family and I have been doing some running. Yesterday, we ran to the local running store and I got new shoes which I have desperately needed! I got Brooks Ravenna 2 (pictured above) which I would not have bought or worn to train for a marathon in since they don't have much medial posting but they are cushy and lightweight and perfect for the shorter runs I've been doing (fewer than 10 miles). I have been wearing my old Ravennas that I got for free and after trying some other shoes on (including my beloved Nike Structure Triax), I decided to get the updated version of them. The new Nike's just seemed like too much shoe--heavy and bulky. I also tried on the Nike Lunarglide 2 for s&gs and they were so flat and hit my feet in the wrong places. I am definitely not a minimalist runner. I like to feel my shoes and their support.
In other news, I registered for my first (sprint) triathlon! It's May 29th (Memorial day weekend) and about 40 minutes from where we live. It's a 300m swim, 12 mile bike, and 5k run. The swim is in an outdoor pool so it's perfect for a newbie like me. I am nervous about the transitioning. I am already figuring out what to wear. My husband has a wetsuit that I can wear and a bike I can ride (I don't even have my own bike. Shame.) But I'm so excited!!! I need to get in the pool and fit some bike rides in in the next four weeks. Woo hoo!!!! There is a triathlon in Annapolis on the 14th but it's $140 to register and I was hoping that would be my first one but the one I entered is $65 and seems better for someone who is new to the sport since the swim is in a pool (and not off of city dock.) The bike is what I am most worried about. I took a Masters swim class three days a week last summer so it's the bike I am probably most rusty at. So that's the news!! I had a month off after the marathon and now I have the itch to train for something new. Wish me luuuuuuck!