Welcome to Civfanatics.
The CivFanatics forums are jammed packed with demonstration and/or succession type games, so I'm not exactly sure what you're looking for - if you can't find it in something like Sisiutil's 'All Leaders Challenges' series, check out other parts of this site such as the
Succession Games Forum. I actually quite like reading
Sulla's game reports from the
Realms Beyond Civilization site, but many of the other players have great reports too.
I'm not the world's greatest warmonger, but consider a general process of;
(1.) Find and settle near Copper - (Iron if you must and you're quick about it).
(2.) Build a Stack of Doom of something like; seven to eleven Axes and a Spear - chop Forests and use Slavery to hurry the process along - be prepared to run at negative

towards the end of your war preparations if it means getting units out quicker through working high

tiles such as Plains Hill Mines.
(3.) Invade a neighbour - ideally one that isn't Protective or has an Archer-based unique unit. When you attack, hit the enemy all at once ... don't dribble attacks on a city over a period of turns, and don't try and take a city if you don't have 'the cattle' to do the job. Two Axes per Archer is usually more than adequate for a flatland city, three per Archer if on a Hill and/or has City Walls. Be prepared to raze cities that aren't fantastic - the city maintenance will catch up with you, so it might be wise to raze sub-optimal cities.
(4.) Continue to produce extra units to cover the losses.
(5.) Once neighbour is either crippled or better yet decimated, spend some effort to re-establish your economy - acquire Code of Laws and Currency, or utilise some other commerce-focussed approach to ensure that you remain competitive in terms of research. Use 'triangle diplomacy' to trade with the AI, but usually not your next target.
(6.) Consider taking out the next opponent with a mass of Catapults and attack units - War Elephants if you're lucky. Specialise your cities if you haven't already, but place a greater emphasis on unit pumps while really concentrating your efforts in your commerce centres (work those Cottages!) and your

farm to keep your economy and technological development chugging along.
(7.) Continue pressing on with large stacks, seige weaponry, and head towards either Riflemen or Grenadiers/Cannons. With a large enough army of Industrial Age units, you should own your continent, and be churning out Galleons for the rest of the world.
Sounds easy - doesn't it!
As before, this is a general strategy, and by no means the only one.