Online trainers can help, but it’s definitely not necessary in your case right now because you can get plenty of feedback and advice here on the forum. Something like this basic approach should work for your situation, both in setting up a basic eating routine and a simple any-3-days-a-week training plan.
How so? I get that your work schedule might be weird and constantly changing, but the food that goes in your mouth is something you have 100% control over. Spending an hour or two each week to plan makes it even easier. You could consider getting an online diet coach just to sort out your nutrition, but again it’s probably not “necessary” right now, just useful.