Relativistic Travel Problem ?

A spaceship with empty mass MSS(?kg), start its journey from A to B which distance is RAB(?ly). The amount of fuel the spaceship
initially carry is MFUEL(?kg), which energy per mass is EPM (?Joule/kg). The spaceship engine efficiency is SEP (?%), and the engine is capable of burning FPS (?kg/s) mass of fuel per second. If the interstellar medium friction constant is IMD (?/s), calculate :

1. The maximum cruising speed ? (SRF and IRF)
2. Length of acceleration and deceleration phase ? (SRF and IRF)
3. Length of constant cruising speed ? ( I expect it to be harder if
there is IMD ). (SRF and IRF)
4. The heat generated by friction ?
5. How the question may look like if we add the energy required to
support the crew which is ESC (Watt) into the problem ?

SRF = Ship's Reference Frame
IRF = Inertial Reference Frame

PS : If the IMD make the equation too hard, you may exclude it.