derek's 90g build, red deer

I am planning a new tank build and selling this one.
my planes are to do a shallow tank, not sure what I want yet I am looking for any help I can get. Any ideas on size, how I should set it up. Lighting i should use i want to go with T5 just not sure what ones yet. My wife gave me the go a head on this as I am turning 40 in march so as a gift I get a new system want tank 100 gallons +