I'm not sure whether you had a typo and entered D60 camera rather than 60D. I'll assume it's the 60D.
Here's the link to the Canon web site for the 60D user manual. Simply download the PDF to your computer and then browse it or print out selected portions as needed.
http://gdlp01.c-wss.com/gds/9/0300004019/03/eos60d-im3-c-en.pdf
As for other 'must haves', the Understanding Exposure book indicated previously is a good start. Read through any of the other 'newbie' threads in this forum and there's a ton of good links for books and online tutorials to get you rolling.
Getting to the 'needed' equipment, yes, 'L' lenses are really good and provide improved image quality and aperture over the non 'L'. But be warned...L lenses are like a drug habit...they will empty your wallet, your credit cards, your tax refund, and anything else you can get your hands on to get them! Been there, done that.
Like so many have done before, including myself, is we go 'equipment crazy' and buy anything and everything that 'might be useful' and quickly discovered it's either junk, useless, or so rarely needed as it could be avoided. One especially common 'trap' that I fell into a couple of years ago was the $40ish screw on 'telephoto' and 'macro' lenses on
ebay. Totally useless, low-quality garbage.
In addition to a good tripod (not cheap...$250 & up) and good ball head for it (another $250 & up), may I suggest a good bag to carry your equipment. You'll quickly find the need to carry a bunch of stuff such as rocket blower, lint free, lens cleaning cloths, spare batteries, asprin, etc. DO NOT PUT ANY LIQUIDS IN THAT BAG! If they leak, your camera & lenses get damaged! Note that as time goes by, you'll need an ever larger bag. At some point, you'll end up having 2 bags...one to carry what you will need that day, and one for everything that stays home that day. While there's a number of good quality camera equipment bags with inserts, etc available, my method is to have several sizes of 'carry on' sized bags (gym bag size, etc) from Walmart, and have a couple of 'good camera bag' inserts to keep things from banging together. That way I won't end up paying $100 or more for a 'great' camera equipment bag only to outgrow it 2 years later. I learned that the hard way in my 35mm photography days.
Another purchase to consider is getting the correct lens hoods for the lenses you have. While L lenses come with hoods from Canon, the others don't. 3 party lens makers such as Sigma or Tamron may or may not provide hoods with their lenses, I don't know. The purpose of a lens hood is to prevent 'stray' light from entering the camera lens, 'bouncing around' and making unusual-looking 'flare', or bright lights of any color, anywhere in the image. Consider a nighttime shot and there's a streetlight about 45 degrees to your right. That angular light coming into the lens may, repeat may, propagate itself into one or more oddball 'lights' in the image. Too often, they aren't noticed until you look at the picture on your computer. They may be eraseable without too much cloning, but it's best to avoid them in the first place. Most hoods are in the $15-20 range...give or take. While 'any size hood that fits' may be workable in some cases, some of the 'generics' on
ebay may fit, but actually show up in the pictures as dark areas around the corners of the photographs. What I and others have done is to go to the manufacturers' website (Canon, for example), look up the particular lens and find out what hood model it uses. Some retailers, such as my favorite,
B&H Photo, show the correct hoods as 'available accessories' when looking at a particular lens. One stop shopping works very well!
A lens hood also makes great protection for your lens(es) against bumps, scrapes, and even some short drops. At worst, $20 worth of plastic needs replacment. While some consider UV and/or clear 'protection' filters will do the same thing, they may...but they also shatter into a zillion glass fragments if hit, and even the best of them (in the $100 range!) will have some, albeit minor, image degradation because the light is going through yet one more piece of glass. Filters also increase the possibility of lens flare, as there are two air/glass boundaries and a layer of glass for the light to change light angles and bounce around some more. So, as mentioned above, start with a good quality ($100 and up) Circular Polarizing filter (CPL) and stop there.
Like all photography gear, especially the expensive kind, make sure you have a NEED, rather than just WANT. If considering a lens, try renting one for a couple of days...especially if it's big and white. Buying one only to discover it doesn't do what you need/want it to costs money and time to sell (at a loss, usually). Especially when considering a new camera body or lens, spend some time reading what others have said about it before plunking down your hard earned cash (or credit) on it.