Spotled Cattleya, Oncidium Sharry Baby and Maxillaria Tenuifolia

[Sunset]

After I discovered this forum I become addicted to orchids and I look all the time for bargains, I was able to have flowers from a lot of Phals and Oncidiums and Cymbidiums, thanks to you all from here.

Today I found three orchids at Lowes( $2.99)
I copy from the tags:
Spotled Novelty Cattleya
Oncidium Sharry Baby
Maxillaria Tenuifolia

and I have an other Cattleya that I bought like a month ago. Please give me any advise to rescue them!

From the pictures you can see how they look like and I want to rescue them.
The Cattleya bought a month ago:





Spotled Cattleya from today:







Oncidium Sharry Baby



The roots:



Maxillaria Tenuifolia





The pseudobullbs are so so dry: