I second @Ctony. Most guys who work tugs live nowhere near a harbor. The usual is paid travel, day rate for a period of weeks and travel home. You probably won’t be crossing oceans as often as ships, but there is a lot of entry level employment to get you started.
As most have said once you get some time under your belt and upgrade you can be a bit more particular.
With tugs you could even swing being hired over the phone. That’s how short we are on tugs.