Welcome to the wonderful world of Bionic. I also came from a rooted Eris, my first Android device. Be sure to turn on LTE in the settings menu. Then download FoxFi and your Bionic becomes a wonderful high speed Wi-Fi hotspot. To replace the HTC Sense clock/weather widget, I finally settled on Fancy Widgets. To conserve space with only five screens, use folders. I strongly recommend Folder Organizer, which enables lots of customizing including nested folders. Using this app, I get by using only three of my five screens.
For accessories, I recommend the Moto extended Battery. Then charge only every 2-3 days! Also, if you drop your phone, it will always land screen-up, after energy is dissipated when the back and battery go flying. I've now dropped my Bionic twice, once on concrete and once on terrazzo. No case, but no harm done. I also recommend the car dock. It makes navigation really convenient.