welcome to the forum .
I will have some of the answers to the questions that you ask :
So lets start with Dendrobium. Dawn Maree.Its a hybrid and the closest species to what you have is Dendrobium formosum and here is a link that will help as Dendrobium formosum is the perant that carried the pod.

http://www.orchidspecies.com/dendrob...argigantea.htm

Dendrobium speciosum loves the heatand very bright light,almost full sun,It has a common name of 'rock lilly'.All the speciosum's want to dry out between waterings and a tatal waterless rest from mid fall to late spring.
http://www.orchidspecies.com/denspeciosum.htm


Dendrobium amethystoglossa would like to be kept moist from when new root growth is under way right through to mid to late autum and then just enough water to keep the canes from severerly shriverling.
Heres a link to it
http://www.orchidspecies.com/denamethystoglossum.htm

Dendrobium. amabile has had a name change and was known as Dendrobium thyrsiflorum .a link to look at is http://www.orchidspecies.com/denthrysiflorum.htm
Water sparingly throught he winter months and reduce the fertilizer until the initiation of new growth in the spring.