No one knows what the lore is exactly and the lore has been changed around a few times now, so I wouldn't stress about it too much. This is what the timeline is though as far as I know:
1983-1987 - FNaF 4, Presumed to take place before the second game and based on the "1983" which shows on a TV.
1987 - FNaF 2, calculated from the paycheck and minimum wage at the time and confirmed prequel to the first game.
1983-1993 - Sister Location, has to be during or after Springlock
suits were used as mentioned in FNaF4 and it's theorized that Mike could be Michael Afton. Most likely takes place after FNaF 4 assuming the brother is Michael Afton.
1993 - FNaF 1, calculated from the paycheck and minimum wage at the time.
2013-2017 - FNaF 3, Presumed from the FNaF website source teasing "30 Years"
Post-FNaF3 - FFPS, has to take place then since Springtrap is burned.
Post-FFPS - FNAFSB, same as the above.
Then I know nothing about the VR/AR games but from what I gather they probably take place around the same time and around the time of FFPS.