noun

a person who is new to or inexperienced at a particular activity.

I’m not a seasoned veteran, but I’m no greenhorn either

novice,beginner,starter,tyro,neophyte,new recruit,raw recruit,fledgling,new boy/girl,novitiate,trainee,learner,student,pupil,mentee,probationer,tenderfoot,rookie,new kid (on the block),newie,newbie,punk