Clearly define the problem, present your solution or reconciliation with the problem, acknoledge objections to your own theory/solution, address these concerns.
Don't be afraid to use the first person.
Don't worry about your writing sounding too dry (i.e. you don't need fancy introductions or transitions - just tell it like it is).
Oh, and REALLY make sure you understand the arguments before writing.
Check out
Pryor on Phi Writing for a much more comprehensive explanation on what it takes to write a good philosophy paper.
Good luck!