It is not rocket sciene, reading order of rebirth is this :
001 DC Universe - Rebirth V2016 (2016) 001
002 Batman V2016 (2016) 000_Rebirth 001
003 Green Arrow V2016 (2016) 000_Rebirth 001
004 Green Lanterns V2016 (2016) 000_Rebirth 001
005 Superman V2016 (2016) 000_Rebirth 001
006 Action Comics V2016 (2016) 957
007 Aquaman V2016 (2016) 000_Rebirth 001
008 Detective Comics V2016 (2016) 934
009 The Flash V2016 (2016) 000_Rebirth 001
010 Wonder Woman V2016 (2016) 000_Rebirth 001
011 Batman V2016 (2016) 001
012 Green Arrow V2016 (2016) 001
013 Green Lanterns V2016 (2016) 001
014 Superman V2016 (2016) 001
015 Titans V2016 (2016) 000_Rebirth 001
016 Action Comics V2016 (2016) 958
017 Aquaman V2016 (2016) 001
018 Detective Comics V2016 (2016) 935
019 The Flash V2016 (2016) 001
020 Wonder Woman V2016 (2016) 001
021 Aquaman V2016 (2016) 002
022 Batman V2016 (2016) 002
023 Green Arrow V2016 (2016) 002
024 Green Lanterns V2016 (2016) 002
025 Justice League V2016 (2016) 000_Rebirth 001
026 Superman V2016 (2016) 002