hi and welcome to the forum
It will also help us with advice if you could go into your user settings and update your Profile with your Location.
the Bl stands for Brassolaelia
you can also download the culture sheets from the American Orchid Society
for Paphiopedilum and Cattleya
http://www.aos.org/aos/orchids/page01.aspx
with repotting I think the orchid in the first pic looks fine only the plant seems to be potted alittle to deep.
the one in the fourth pic looks good also.
the orchid in the fifth pic the mix looks as if has brocken down a fair bit you could take the orchid out of the pot and replace the mix you can use the same pot it will need to be steralized befor its reused.
as for the marking on the leaves it could be to much water it could also be rottern roots.
have you had alook at the roots ?