Former finance minister Tendai Biti said on Thursday that Zimbabwe needed to mend relations with foreign donors to help kickstart an economy critics say was run into the ground by long-time President Robert Mugabe.
Mugabe's resignation followed an impeachment motion adopted by Zimbabwe's parliament on Tuesday.
"Everybody is crying for our country", he said.
The new government, the ERC said, must focus on strengthening state institutions such as the Zimbabwe Electoral Commission, the Zimbabwe Human Rights Commission and the Zimbabwe Republic Police. Presidents of Angola and South Africa cancelled a trip to Harare after Mugabe agreed to step down following pressure from the army, his party and ordinary Zimbabweans who flooded the streets.
As new leader of the ruling ZANU-PF, he is expected to be sworn in as president to see out Mugabe's tenure ahead of elections next year.
Boris Johnson said the end of Mr Mugabe's reign appeared to be a "moment of hope" for the people of Zimbabwe, and should not be allowed to mark "the transition from one despotic rule to another".
"The immediate priority is to ensure that Zimbabwe has a legitimate government, appointed through free and fair elections in accordance with the constitution".
Asked if Mugabe and his wife, Grace, should face justice, Johnson says: "That is a decision for the people of Zimbabwe".
However, Pretoria was yet to issue any communication with regard to the developments in Zimbabwe after President Jacob Zuma called off his trip there at the eleventh hour on Wednesday after Mugabe resigned.
However, Mugabe and his family own several properties in South Africa and the couple's two sons, Robert Jnr and Chatunga live there.