Sweden

[The historian]

Now at 1750 conquered most of Poland all of Russia, Denmark, Dagestan,Crimea, Georgia and Courland now fighting the Prussians. I have been badly defeated by the Inuits
Strategy has stated the start up so i'll go straight to what i have done.
I used a Denmark first policy After 3-4 turns of army preparations(garrisoning Riga and Petersburg with some more units and used my armies to strike the Danes. Turn 5-6 I took both Copenhagen and Norway in a surprise attack lost the fleet however. After wards i focused on Russia. They were at war in the south so I capitalized on that and allied with the ottomans also Poland was busy fighting Prussia.
Hod the line and proceed to a slow methodical advance through Russian and polish territory. Taking Denmark and Norway should give you the monetary muscle to field some 3 advancing armies with which you also garrison the border regions as you advance. Don't defend every town and farm just defend the region(city) let the Russian and Polish armies burn what they want focus on the advance. As i advanced i took Lithuania and Minsk from the poles and Karelia from the Russians. This with the 3 armies I mentioned also kept a sizable garrison in Riga should Courland attack. Once Moscow and Kiev fell some 5 turns later Russia was a cakewalk with one last big battle in Astrakhan the last province i took were they concentrated their army, their other army was busily burning the don region and disappeared when they fell.
After i took Galicia Poles sued for peace and i accepted.Once this is done should be about 1720 invest in Russia heavily, convert it and build it up, once developed you'll be swimming in cash. Keep the garrisons(armies) in the border regions and the ottomans friendly usually no major will attack you at this point.
Daghestan Crimea and Georgia did but you can handle them just keep Austria and the Ottos friendly .This isn't to hard as even with Russia not developed you should be good for a state gift from time to time also trade with them.
As you strongly garrison some regions to keep the front build up research there so you can lead the tech race. Stealing research from German minors is quite profitable too. You should be able with 8-10 universities to stay well ahead in tech. Take Iceland when you have the time or money. The poles and Prussian might give you some trouble but usually they are fighting among themselves and with the Austrians. In my game Courland beat both Poland and Prussia destroyed the first and almost conquered Berlin till i stepped in.

In short
I Secure Scandinavia
II Take out Russia
III Hold the front in East Europe Kiev Lwow Vilnius(Minsk partially) for some 20 years to develop
IV Develop Russia and your own territory, befriend the other major powers (Britain, Ottomans especially) so you can trade with them, research everything in the 20-25 years of peace. This should give you anything you need to do whatever you like afterward's . I'm considering invading India through Persia

Never made a guide before hope it helps