Istanbul gathering comes as Turkish government becomes one of the key backers of transitional government in Mogadishu.
Somalia needs a global reconstruction effort to back up ongoing stabilisation efforts and stop the Horn of Africa's 20-year descent into chaos, leaders said at the start of a meeting in Turkey.
Representatives from 54 countries gathered in Istanbul on Thursday to find a path towards a better future for a country that was the reason the term "failed state" was coined two decades ago.
"After a long period of instability and conflict, we now have ahead of us an opportunity for genuine peace and security," Turkey's Deputy Prime Minister Bekir Bozdag said at the opening of the Second Istanbul Conference on Somalia.
He said the capital Mogadishu - where pro-government forces have largely driven out Islamist fighters - was now open for business and called for a broad international reconstruction effort.
The two-day conference - which follows a London meeting in February - kicked off with discussions among senior officials, experts and businessmen on four key issues: water, energy, roads and sustainability.
On Friday, the conference will turn its attention to the political dimension of aid to Somalia, with the participation of UN chief Ban Ki-moon, Somali President Sharif Ahmed, Turkish Prime Minister Recep Tayyip Erdogan, as well as British Foreign Secretary William Hague.
"Somalia's future is in the hands of Somalia," Somali Prime Minister Abdiweli Mohamed Ali told the conference.
He said Somalia was ready for long-term development and urged "multiple donors to set up a trust fund for Somalia".
One major objective of the conference will be to outline the future of Somalia by setting goals for 2015, according to the Turkish foreign ministry.
The mandate of Somalia's transitional institutions is to expire in August and the current administration is battling against time to reclaim control of the territory before it dissolves.
In-depth coverage of the regional political crisis
Lawmakers are struggling in efforts to achieve a "roadmap" signed by Somalia's disparate leaders for the formation of a government by August 20 to replace the weak transitional body in Mogadishu.
Under the agreement, the latest among more than a dozen attempts to resolve the bloody civil war, lawmakers must agree on a system of government for Somalia's fragmented regional - and often rival - administrations.
The Istanbul meet comes as government troops backed by the AU force and anti-Islamist militia attempt to wrest control of Somalia back from the al-Shabab, an insurgent group that has declared its allegiance to al-Qaeda.
Forces from Uganda, Burundi and Djibouti are fighting with the AU contingent, while neighbours Kenya and Ethiopia have also sent troops across the border in a bid to flush out al-Shabab.
"One of the big problems up until now is that big interests have benefited from the violence and lack of control," said Al Jazeera's Peter Greste, reporting from Istanbul.
Our correspondent said Somali political stability would improve "if they can control those spoilers - keep those business and politcal interests to one side".
During Somalia's devastating drought last year, Turkey launched a major diplomatic, economic and humanitarian push and become one of very few nations to set up an embassy in the capital.
It was opened following a visit in August by Turkish Prime Minister Recep Tayyip Erdogan, the first major non-African leader to visit the Somali capital in almost 20 years. Direct flights between Somalia and Turkey started in March.
A stream of Turkish aid workers have been sent to Mogadishu, with some even bringing their families to a city that has been dubbed the most dangerous in the world.
In his high-profile 2011 visit, Erdogan stressed that the international community's response to Somalia was a "test for civilisation and contemporary values".
Somalia has had no effective central authority since the 1991 ouster of former president Mohamed Siad Barre touched off a bloody cycle of clashes between rival factions.
Since then, the country has been variously governed by ruthless warlords and militia groups in mini-fiefdoms, becoming the epitome of a failed state.
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