Short answers, pulled from the story.
Sergei Witte issued a manifesto on the 6th of August 1905 to convoke the new legislative body. The first session opened four days after Fundamental Laws were signed on the 23rd of April 1906, beginning on the 27th of April 1906 within the Tauride Palace in Saint Petersburg.
The first State Duma contained around 500 deputies but lasted only 73 days until the 8th of July 1906. Most radical left parties boycotted the election leaving moderate Constitutional Democrats with roughly 184 seats while an alliance called Trudoviks held about 100 positions.
The third State Duma convened from the 7th of November 1907 until the 3rd of June 1912 under changed electoral laws that favored gentry landowners and businessmen. This conservative body supported military improvements and Stolypin's land reform plans while Octobrist party held around one-third of all deputies making them the largest group.
Alexander Kerensky served as a promising new Trudovik member alongside Roman Malinovsky who was a double agent for secret police. In March 1913 Octobrists led by Guchkov commissioned an investigation into Grigori Rasputin allegations while Boris Stürmer replaced Goremykin as prime minister on the 9th of February 1916.
State Duma formally dissolved on the 6th of October 1917 following Kornilov affair. A Provisional Council convened on the 20th of October preparing for Constituent Assembly election after the Provisional government decided Duma would not reconvene on the 2nd of March 1917.