in the circuit i posted Q3 and Q4 are constant current sources. Q3's preset current is 700uA which is divided evenly between Q1 and Q2. Q4's preset current is 7mA. Q4 acts as a linear load for Q7 (a resistor would work in place of it, but since the current would no longer be a constant value, it would introduce even harmonic distortion, and wouldn't have the voltage swing it needs to drive the outputs).
you have to realize test circuit conditions are only to establish a baseline for testing for the data sheet. they are not necessarily the conditions you operate the transistors at. otherwise, transistors and other linear devices wouldn't be as useful and flexible as they are. just because the data sheet shows the devices being tested at 10V and 10mA doesn't mean that's where you have to use the device.
the point of this whole exercise is for you to learn how these devices are used in the real world. also, i suspect your teacher wants you to learn how to put theory to use. so, use this opportunity to learn how to put theory to use. it sounds to me like you are looking for a "pre-fab" answer to the problem rather than trying to solve the problem yourself. engineering is about problem solving. this is why your instructor wants you to build from scratch rather than just plugging in a chip.
knowing WHY something works is what separates tinkerers from engineers.