Q: I'm interested in food photography.
That's actually a broader statement than you may realize. Are you interested in professional food photography? Taking pictures of food that you've made? Taking pictures of food objects (say, a tomato or a carrot), or prepared food products (say, a gumbo, or a ham sandwich)?
Q: What lens are best for food photography?
Like most things in photography, there's really isn't going to be one 'best' choice that works for everyone all the time. It's not like there's a 'food photography lens' shelf at the camera store, after all. :-) What lens is going to be best is really dependent on what you want to accomplish with the lens... and the truth is that in all likelihood you need to be prepared for the idea that what you're really looking at is a few lenses that will help you accomplish the different looks you are after.
Now I do a fair amount of professional food photography, mostly of prepared food products for clients menus, or advertisements. If that is your goal then I can tell you that "in general" the lens you choose should be the best one you can possibly afford, but that the lens/camera is only 1/3 of the formula for a great shot... The other two elements being
- The food stylist
- The lighting setup
In general food photography is one of the more equipment and time intensive photographic disciplines. To do it well you can expect to lay out some serious cash... For your camera and lenses, sure, but also for your lighting setup, and in collaboration with food stylists, art directors, etc.
Q: There are some cheap ones with f/1.4 and there are the zoom lens which costs 3-4 times more.
Again it depends on what you plan on doing with the lens. In a general for food photography there is plenty of time to compose shots, move the camera around, etc. And (I know it's like a broken record with me) in general food photographers tend to favor a bag full of prime lenses over a zoom because... (sigh) in general, prime lenses have a wider range of f-stops available, and tend to be crisper than zoom lenses because there are fewer moving parts.
If, on the other hand, you're planning on taking pictures at food competitions, where you've got cooks racing around trying to build a 19 foot cake sculpture (or whatever), then having a zoom lens may be well worth the extra expense as you won't necessarily be able to serenely compose your food shots, of have full access to the area you're taking pictures in. In scenarios like this you won't be getting the shots your after if you don't have a zoom lens!
Q: Are there any other options?
Not really. Zoom lenses. Prime lenses. Those are your options...
Q: Can I take nice photos with the f/1.4?
You sure can! You can also take awful pictures with an f/1.4 lens too, though. :-) The magic isn't in the lens... it's in you! :-) I know, I know... I sound like a broken record... but food photography especially tends to be equipment heavy, and collaborative. Food stylists generally have the experience necessary to know how to make the food look amazing, and lots of lighting is generally necessary to make it pop on camera. There aren't really any shortcuts either... One light (or natural light) setups can never look like a 6 or 7 light studio shoot.
Q: Are the zoom lens necessary?
It depends on what you plan on doing with it... See my more full answer above.
Q: What settings are the best.
Just like there's not going to be a "one best lens" for food photography, there's also not going to be a "one best setting" for your camera. In general (I might need to start abbreviating that), food photographers shoot in full manual mode and understand every setting on their camera. This gives them the power to be able to manipulate the camera's settings in order to achieve the outcome that they want in their photograph.
There really is going to be no shortcut to actually learning how to use your camera when it comes to food photography, unfortunately. We're not going to be able to dial in your settings for you over the internet... :-) Fortunately the photo-SE community has some of the best advice available for learning how to use your camera, so without sounding like a used-car salesman, I'd advise you to use the photo-SE community to learn how to really use your camera!