The announcements won't be made until after Alexander M. Haig Jr. gets through his confirmation hearings, but the secretary of state-designate is believed to have his top aides already lined up.

His number two man may or may not be California Supreme Court Justice William P. Clark, who has been offered the job of deputy secretary of state but hasn't decided whether to take it.

The department's third-ranking job -- undersecretary for political affairs -- will go to Walter J. Stoessel Jr., U.S. ambassador to West Germany. Lawrence S. Eagleburger, ambassador to Yugoslavia, is expected to get a key job, probably assistant secretary for European affairs.

Other State Department appointments that look firm: Myer Rashish, an economist and member of the Reagan transition team, as undersecretary of economic affairs; Paul Wolfowitz, a former Pentagon official, as director of the policy planning staff; Richard Burt, a former New York Times reporter, as director of politico-military affairs, and Chester Crocker, of Georgetown University's Center for Strategic and International Studies, as assistant secretary for African affairs.

Former senator Richard Stone of Florida, a Democrat who is on Reagan's foreign policy transition team, is listed in some reorts as a leading candidate for assistant secretary for Inter-American affairs. Others reported to be leading candidates in their respective areas include John Holdridge, currently the chief CIA specialist on Asia, to be assistant secretary for Asian and Pacific affairs, and George Carver, former CIA official on Vietnam and Germany, to be chief of State's bureau of intelligence and research.

Sherwood (Woody) Goldberg, a Philadelphia lawyer who has been assisting Haig during the transition, is expected to stay with the new secretary of state as chief of staff and interal trouble-shooter, with a special assistant's title, and former New York senator James Buckley will be undersecretary for security assistance and technology affairs.

The list of candidates for head of the Arms Control and Disarmament Agency may be down to two names: William R. Van Cleave, a Reagan defense policy adviser who headed the transition team at the Pentagon, and Gen. Edward Rowny, who was a member of the CIA transition team.

Van Cleave was, at one point, thought to be out of the running for any administration job, supposedly because of a serious tiff with Caspar W. Weinberger, the secretary of defense-designate.

In Defense, the third-highest job -- undersecretary of defense for policy -- appears likely to go to William Howard Taft IV, former general counsel at the Health, Education and Welfare Department. Taft, a great-grandson of President Taft, has no substantial defense experience, a sticking point with critics who have noted the same thing about Weinberger and his choice for deputy, Frank Carlucci.