A few things about Weber (no idea what you are aiming for):

His most famous work (as said otherwise) is The Protestant Ethic and the Spirit of Capitalism. The basic notion of the book is that certain religions - protestantism - was beneficial to the development of capitalism. Ascribing (religious) value to the idea of hard work and considering earning individual money a symbol of God being favourable to you created a much better environment for the industrial revolution than the (then-prevailing) catholic idea of money being sinful and 'bad' for you (wherefore you should give them to the church). One major conclusion to draw from Weber's work here is that he basically goes against Marx' ideas of 'base' and 'superstruction' - it is not the economic reality that determines the ideas, but the ideas that help shape the economic reality. Actors determine the structure in other words.

Weber also did a lot of work on the concept of The State. Most famously perhaps seen in his statement that The State is defined by having the legimate use of force.

For your work - considering the other works you mention - it might be his works on 'bureaucracy' which are of particular interest. He basically invented (this was written 100 years ago) the notions of bureaucrats - efficient, non-partial, adhering to the rule of law etc. working in the public administration. 'Rationality' is a key concept in this regard. Admittedly there was a pessimistic, almost Orwellian side to Weber in this also, as he thought mankind would get lost in an 'Iron Cage of Rationality'.

To continue where Brucelee left of and quote Wikipedia for you:

"Weber is also well-known for his critical study of the bureaucratisation of society, the rational ways in which formal social organizations apply the ideal type characteristics of a bureaucracy. It was Weber who began the studies of bureaucracy and whose works led to the popularization of this term.[46] Many aspects of modern public administration go back to him, and a classic, hierarchically organised civil service of the Continental type is called "Weberian civil service", although this is only one ideal type of public administration and government described in his magnum opus Economy and Society (1922), and one that he did not particularly like himself – he only thought it particularly efficient and successful. In this work, Weber outlines a description, which has become famous, of rationalization (of which bureaucratization is a part) as a shift from a value-oriented organisation and action (traditional authority and charismatic authority) to a goal-oriented organization and action (legal-rational authority). The result, according to Weber, is a "polar night of icy darkness", in which increasing rationalization of human life traps individuals in an "iron cage" of rule-based, rational control.[47] Weber's bureaucracy studies also led him to his analysis – correct, as it would turn out, after Stalin's takeover – that socialism in Russia would lead to over-bureaucratization rather than to the "withering away of the state" (as Karl Marx had predicted would happen in communist society).[48]"