Set passcode on 4s

[djr46]

I'm almost shaking when I start to set a passcode on my iPhone 4s.
Can someone tell me the proper procedure And suggestion on using the 4 digit passcode as opposed to a more complicated passcode.
I need a step by step to keep from locking myself out. Scarey to me as a less than tech smarts user..
Help.......
DJ

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[kch50428]

http://help.apple.com/iphone/8/#/iph14a867ae