To add a few opinions to all this. Yes olive oils (esp virgin and extra virgin) are healthier to use but don't work as well in some dishes, so it depends on what you are preparing. Veg oil will give you a crunchier result, where olive oil is more for flavoring and texture.
If you want to focus on healthier foods remember you don't need to fry or add oils to all meals/meats to make them taste good. My rule of thumb is if I am breaking and frying the main course then I use oil. If not then I generally use a good pan sprayed with pam and at most add a little of oil or butter for flavor. And did you know that if you use half olive oil and half butter (or fake like I can't believe it's not butter...but no margarine that stuff is wax!), then it adds a nice flavor to what you are cooking, you need very little and it can be the base of a good sauce.
If you are a new cook I'd suggest you call family, friends or even post here and ask from some tried and true good recipes. Try them and feel comfortable with that AND the point of this is to see different styles of cooking. To be a really good cook you need to get the feel of what works and doesn't and soon you will just be tossing things together!
Heck, modesty be damned (hehehe) I consider myself an excellent cook (as do almost all my friends so I hope I am lolol), but often I go with a super simple recipe just to save time and not blow calories etc.
For examle say you want to make a pork chop. You could bread and coat and sure it would be yummy. But if you like sweet w/meat as I posted recently one of my fav ways to make them is to season the pork lightly w/salt and pepper. Then I coat with a medium thin layer of Apple butter, often flavored such as Pumpkin or Peach apple butter. It creates a natural seal and locks in moisture so you get a succulent, juicy tasty chop. And prep time is about 2 minutes lol. Works great with skinless chicken breasts too!!!
So just a few thoughts. There are tons of recipes online...you could just poke around for easy recipes. I think I even have an ebook about this.
Relax, have fun and enjoy!