Significats de total newbie en anglès

So these are impressions from a total newbie.

A total newbie, I arrived at the Headon Boxing Academy in Sandyford not knowing where to begin.

Why would this veteran developer, known for his boundless energy and affinity for adventure, want to take me, a total newbie, under his wing?

I'm sure that I could not have progressed from a total newbie to a regular PG contributor within a 5-month period without this support structure.