Do you know if your area really demands a master's in informatics? Or do you want a graduate degree for yourself?
I was asking myself the same question, because I figured a masters in informatics would put me a step ahead. I ended up talking to numerous people at my facility and found out that they really cared more about work experience not so much a degree. Often they felt the the degree was nice but didn't really prepare anyone for the role. They suggested volunteering and becoming a super-user so I had more experience with our applications. I went on to support our go lives and did a little education and training for all employees during our transition. I ultimately ended up interviewing at another facility and getting a full-time job as a clinical informatics education specialist; I basically teach all employees how to document in the system and create various types of educational materials. I am finishing my masters in nursing education simply because it opens more doors, and I wanted a higher degree for myself.
As far as certifications go there's a couple you can go for but all of them require work/ education experience.
There's the RN-BC in informatics which you could get if you meet the educational requirements.
CPHIMS or CAHIMS which requires work experience.
I would focus on getting experience to see if that's what you like, and try to get experience with various applications. While I'm a great clinical resource, its my IT skills that sold me and my experience with various programs (like Lectora, Camtasia, web design etc) since I create materials/web site maintenance using those programs.