questions about RPG paper-based games?

Question

my dad and I play this game alot like D&D, and I was wondering if anyone had any cool ideas to help make it more fun (I'm the GM)

its historic, medival times.
my dad plays a Useur (my own invention, a race made up of powdered lodestone), and hes def the power-hungry type.

Answer 1

I'll be broad here, since I don't know what world you're living in (Futuristic, Modern, Medieval, Ancient, something out of this list).

Get into the mindset of your fellow players - know what they like the best.

Some gamers are power-hungry, and love to test their skills on the nearest opponent - give them lots of opportunity for combat and a lot of item-based rewards.

Some people love a good story (and even then, of a certain theme - romance? political intrigue?) - make a good story, and try to put their characters into the story, by tying up their backgrounds to events that happen in the game.

Some people love to think, so go for puzzles, or give them a way out of a huge problem by allowing the use of their wits instead of their weaponry.

Don't be didactic with your games - put your players on the edge of uncertainty. Break the mold. A simple double-cross will usually liven things up.

Give something more specific for the answer-ers to work with, and more people can suggest ideas.

EDIT: (Additional)

Then pepper your adventure with interesting challenges that force your players to make tactical decisions. The more of an action-hero you can make your father's character, the better he will enjoy the game.

Don't be stingy with the loot too - remember that a DM/GM can always up the challenge rating, no matter how god-like the player is.

The objective is to make the players feel that they're making a difference in the conflict, despite the fact that they're few in number. Try giving them a quest that sends them behind enemy lines, or, if less politically inclined, you can either send the party against something of the requisite challenge level, or something slightly tougher - such as a bandit empire, or if you're allowing something mythical, a dragon-esque epic quest.

Holy Grails may be cliche, but they always add luster to any adventure.

Answer 2

Read through some adventures, and see if you can find Dungeon magazine for a few nifty adventures in each issue. Dragon magazine also has ideas galore for adding to a game or for just generally improving your game.

ENWorld.org has plenty of helpful tips too, and much more.

Answer 3

get the dice rolling on ability score checks. such as, "i decide to go visit the mountain" roll d20 and see if you land under intelligence score to see if character finds it anytime soon.