several websites have good information.
gliders like company in just about all cases (I think)
getting scent familiar is very important. pouch swapping.
cages 8" apart very good.
no need to rush.
neutral site, then neutral cage.
we have had lots of success 2 plus 2, then 4 plus 2, then 6 plus 2.
at 7 plus 3 we had one of the 3 rejected and had to put her in a separate cage. But we may have rushed the last introduction.
wife also did a 2 plus 1 very successfully.