Great suggestions above.
Couple of small things:
to cook chicken or fish in the oven, try seasoning it well with salt and pepper (maybe a bit of lemon) and wrap it in foil with some sliced onion and a sprinkle of water - not too tight, more like a little parcel. 350 for 20-30 mins, or until ready (when fish flakes, chicken has no pink juice when pricked w a fork)
definitely try extra light tasting olive oil. Two tablespoons is way too much for your eggs - a drop on a paper towel and wipe the pan is more like it, like someone said above.
Frozen veggies are cheap and easy - even easier with the Steam-in-a-bag ones
Don't think of it as all or nothing for now, try out some meals first.
Feel free to reach out to me if you need some help with what to cook, I want to help.