I’d add them all at once if you can, if you can’t, try to source females (introduction will be much easier - I’ve struggled to add males previously, but adding females of those same species worked perfectly).
If you can’t add them all at once (I’d aim for females whichever way you go - who doesn’t love to watch the transition?).
I’d add the lineatus last, they can be quite feisty and thus are able to hold their own incredibly well. I’ve had 2 of these - 1 male, which his introduction went worse than you could ever imagine, he got thrashed and bashed around. Then, I added a female and well, she went in with no issues whatsoever! Maybe a bit of chasing which is expected, but nothing deadly unlike the male.
The hooded flame will want to be added alongside the blue flasher, this is mainly because both of them will likely become targets for the 8 line flasher. So adding both at once will help to disperse the aggression.