Yes you can start the applicatioon 90 days before your 62nd birthday. Many people do this on line but there have been a few snags for some people and I've heard it a PIA to straighten out.. Go on line and find a local SS office close to home. We did that. Link here. just put in your zip
https://secure.ssa.gov/ICON/main.jsp
It may take a few weeks to get an appointment but working with a human being is far better vs getting hung up in the systems. When you make your appointment they will tell you what to bring. All your Identification of couse , if they sent you SS statements bring those along as well. They will ask you your rough eanings prior to taking SS or that year and if you expct to have added earnings once you start.
Caution once you get that first check your earnings are restricted to $1470 a month in the first partial year of benifits. So if your on SS the last two months of 2019 all you can earn is $1470 *2 . You can ean more in one month and less in another as long as the average does not go over $1470.
If you earn more SS can deduct $1 for ever $2 you earn over the threshold. This gets changed as you get closer to your full retirement age but it is somethng to be aware of.
If your birthday is the 1st or 2nd of the month say November 1 or 2 then your first check would hit in December but otherwise they want you to wait a full calendar month to pass before recieving a check.
Do direct deposit as it is easy and there will be no doubts about where the money goes and when its there. I've heard losing a check via the mail becomes a PIA to resolve.
Good luck