Hi i am looking to set up an exo terra 90x45x60cm half land half water with a filter to run a water fall and add a rain system to come on every 2 hours for half an hour thats the set up i want now for the questions.

how many frogs?
can i have fish with them?
what plants?
i will need an infa red heat lamp cos my house is cold is this ok?
do i need a heater in the water?
how often do i change the water?

i think that will do for now if theres anything inportant you think of please let me know. i do have some knowledge on frogs i have some dumpys thanks