Welcome aboard. 
GC Specialist is a good focus type to start with while learning Xert.
Lots of newbie tips are posted in this thread –
Beginner questions
If no event in mind (no TED set) you could simply ride for fun with a goal of losing weight over time to improve W/kg along your power curve. With that in mind consider some long slow rides below LTP when possible. Perhaps on weekends?
You’ll retain your natural sprint power while building out your profile with low intensity base.
Cycling fitness is a long-term endeavor. You’ll likely see some marked improvements during your first year then incremental improvements year to year.