You have some unlearning to do. Once you do, you will find things a lot easier to do. One thing I would suggest you do is go under the Black Apple menu and select System Preferences. . .
Do some exploring there. The Track Pad settings are there. You can turn on Tap to Click, Secondary click by using two fingers to tap, and Three Fingers to scroll, etc. Once you get used to using them, it makes things much easier. . . and you'll find you can't get along without them. Explore the general settings, Desk Top & Screen Savers, and the Dock.
OS X Yosemite System Preference
The button at the top of the window with all the dots returns you to the main home window for System Preferences. This Window also has Users & Groups, where you will set up different users. You should set up a STANDARD user account now for your every day computing and have one ADMIN account for installing software. This will keep your computer safe while surfing the internet.
Prnters & Scanners is where you will set up your printing.
If you are worried about security of your data, Security & Privacy is where you turn on the Firewall (it is off by default and most Mac users leave it that way) and you can turn on FileVault to encrypt your hard drive to a 256bit AES standard using your password as a key. . . which is also entangled with the computer's 128bit UUID, giving you a key that is the 128 bits plus the length of your passcode. For someone to break into it without your password theoretically would take billions of years to decipher.
Be sure to set up an iCloud account with an AppleID. Your AppleID will allow you to reset your password to your computer should you ever forget it. . . and if you turn on FindMyComputer, you can use that AppleID to locate your computer and to remotely erase the data and lock it from being used by the thief. Only you can get into your computer. Make your AppleID password different from your computer password. Do select a hard to guess PASS PHRASE using non-dictionary words, numbers, and keyboard symbols. Make it something you cannot forget. If you forget it, you CANNOT recover anything, . . and Apple cannot help you. They will not have your key and there ARE NO BACKDOORS.
creating a random nonsense passphrase that is easy to memorize using dice.
Take any book, subject matter is unimportant, and a pair of dice. Open the book to a random page. Roll the dice and note the total of the dice. If the results are odd, turn backwards that many pages, if even turn forward that many pages. Roll the dice again and then if odd, count upward from the bottom of the page on the left, the number of lines of the total, if even, downward from the top of the right side page the number of lines of the total of the dice. Roll the dice again, and note the total. If the number is odd, count the total number of words from the left of the total on the dice, if even from the right. That is the first word in your passphrase.
Repeat the process until you have a passphrase of four to six words, choosing a new starting page randomly each time. This will result in a random passphrase that is completely nonsensical but easily memorized. Add a random number of your choice to the phrase and a keyboard symbol. Done.
Using the US Constitution and an on-line dice roller, this is what I came up with:
Drop out the spaces and you are finished.
Memorizing six words is easy. . . and the symbol and number positions also simple. Voilá, a random nonsense passcode impossible to guess and not crackable. Need a shorter password? Set your number of words for fewer rolls of the dice. . . or set a rule that says, "find the nearest word in either direction that is five (or four if you want even shorter) letters." Then that is your word. Simple.