What was on the differences between the birtish and american forces at the beginning of the revlountiary war ?

There were may differences between the two forces.

Explanation:

The British army was one of the best armies of the world by the end of the 18th century. It had a lot of experience given constant warfare in Europe, it was very well trained, it had skilled command and leadership, and it was well equipped, though long lines of supply proved to be one the reasons of its defeat. On the other hand, Washington´s Continental Army was new and  unexperienced in the beginning, it had initial problems of discipline, it didn´t have experienced and skilled commanders , and it had inferior firepower and logistics problems until it could secure French support. But they were patriots and fought for a higher cause.  

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.