New to field

Hello I have been fortunate enough to have been hired by a local gastro office for medical billing and coding. This is my very first job as a CPC and I really would like some more info regarding coding, the use of modifiers, and especially more in-depth knowledge of E/M services in this field considering I will be doing this on a daily basis.
Can anyone suggest any webinars, or articles I can read to further my knowledge? Thanks
Debbie CPC-A in CT

New to field