Here is a brief summary of the different interior themes (my mod page goes into greater detail ) :

Hunter:

Your home is designed in the theme of a huntsman, your home is covered in pelts and trophies from your hunts in the wild. Your home gets extra weapon racks, a special tannery, and workstations for weapons and armor.

Mage:

Your home is designed to reflect a mage who lives one with nature to study its secrets. Your home includes friendly forest animals, enchanting and alchemy workbenches and storage, and extra weapon racks for your collection of magical staves.

Thief:

Your home is designed to reflect a thief who's home acts as a secluded safehouse for all your loot. Your home is filled with stolen goods and extra storage for your most precious valuables. Your home also gets extra dagger displays, weapon displays, and bow racks.

Assassin:

Your home is designed to reflect a ruthless servant of the Night Mother. Your home has a poison lab and weapon grind to ensure you are prepared for the next mission. Your home also gets extra dagger displays, as well as a small garden of poisonous plants for your concoctions.

Stormcloaks:

You can raise banners around your home in the name of Ulfric, as well as build a small shrine to Talos upstairs.

Imperials:

Raise banners in the name of the Emperor, and build a shrine to the 8 divines to guide you in battle.

Hidden Lair Vampires:

You add a hidden lair accessible via a moving bookshelf. The lair is designed in the theme of the Vampire (it ended up looking a lot like Dawnguard coincidentally! Purple lights! WOOO). Your lair contains a poisonous garden of plants, a table for mixing poisons and an eternally sleeping prisoner kept asleep by your unholy magics around the room.

Hidden Lair Werewolves:

You add a hidden lair in the name of the Lord of the Hunt. A shrine to Hircine stands center in your cave, and nearby you have a silverhand captive (re-spawning!) to feast on or sacrifice in the name of the hunt. You also get a small smithy to fashion the perfect weapons for your next hunt.

The exterior additions are numerous and detailed on the mod page and video well enough I think


Getting Started!

You build the home! Go gather the materials! Keep an axe handy and a pickaxe at your side, finally
you have reason to go out there and collect stuff!

The home is situated just outside of the Abandoned Prison, at Lucky's Shack. Check the Images if you
don't know what I'm talking about. Fast travel to the abandoned prison and you CANNOT miss the home,
its right up river.

Once there, be sure to pick up Lucky's Journal inside the (convenient!) shed, where you can also
store all of your building materials. In Lucky's journal it depicts his plans for the home, so you
know what materials to gather! To start the construction find the workbench with the deed on it, and use it!