I'm currently having a good game with Sweden based on this thread thx mate. I first took care of Denmark b4 i even bothered with economy as they become an annoyance and quickly build a large army in Denmark, I took care of them easily enough with a slight pain from their navy though. I then built up my economy and trade while just building a mass militia army to protect the east from the Russians as Poland declared war but never attacked me. Then i focused on Russia and decided to destroy all of them instead of just their Baltic regions mainly out of spite cause their crap lol. Once they were done I've now focused on Poland who have pretty much wiped out Prussia and i own all the Baltic regions and have allies on all sides in France, Spain and the Ottomans.
So far it's looking good and i have taken over the island region in India for when im settled in Europe, I was going to take over Mysore but i failed and then the Mughals took it over and own all of India now.
Also i somehow caught a Heavy First Rate ship from Denmark or the Netherlands although i can't remember going to war with them un less i declared because they attacked France