By the way, I don't know if it's a little late already, but I have some information about the ministers and politics of Spain for the time.
King: Felipe V: reformist king. Extended the model of castilian administration and governance to the other iberian kingdoms and holdings, with the exception of the vasque countries and Navarra, for their support over the war.
José Patiño y Rosales: By the time of the star of the game, he is recently dead. But he reorganized the economy of the kingdoms, modernizing them, and cutting unnecesary charges.
Marqués de la Ensenada: the succesor of Patiño, he wasn't a great reformist like him, but he continued his labor, mantaining and, in some cases, expanding them, specially in the navy and the treasury. He was a great minister, in many ways a perfect succesor for Patiño. He also made ampliations in the Canal de Castilla, a fluvial way connecting the most important cities of the Spanish interior, similar to the Canal of Midi. He promoted the sciences, sending spanish to foreign science academies, and funding several in Spain.
José de Carvajal: similar to Ensenada, he helped him with several reforms. He would be an alternative for Ensenada
Jerónimo Grimaldi: foreign minister. Reinforced the several family pacts of the Spanish Crown with the bourbons and other spanish allies.
Fernando de Silva y Álvarez de Toledo; sucessor to José de Carvajal. Perhaps he would be a good choice for spionage.
José Carrillo de Albornoz: a good general for his time, and perhaps the best option for minister of war
Isidoro Gil de Jaz, as minister of security. An extraordinary administrator, and a good reformator. He started a good numbres of houses for orphans and disabled in Sapin and its colonies, trying to take care of them, and to give them a productive place in society.
Miguel Romero Stéfani: minister of armaments: his most important works were in fortifications, both naval and land ones. Also reformed the arsenal of Ferrol an Cádiz.
As far as ideas go, I would suggest an event with the option of not deporting the jesuits, in exchange with bad blood with Portugal.