Oh man I just found that Modders Resource Pack by Oaristys and Tony67 like less than a minute ago, I am so excited to mod now it's a great feeling! Too bad it will end for a week starting tomorrow lol

Edit: That weapon rack, bookshelves, plaques resource looks extremely helpful by the look of comments too, probably going to have to grab some of that stuff as well

You can still mod offline. I almost exclusively work offline. Just make sure everything is working and set Steam to Offline mode.
Here are a few other links:
Modders Resource Pack by Oaristys and Tony67
http://skyrim.nexusmods.com/mods/14135#content
Grimoas Picture Frame - A Resource for Interior Decorators by Grimoa
http://skyrim.nexusmods.com/mods/10963
FoodContainer Resource by Blary
http://skyrim.nexusmods.com/mods/14133
PotionShelf Resource by Blary
http://skyrim.nexusmods.com/mods/14136#content
And my second favorite (General Stores being my fav):
OpenBooks Resource by Blary
http://skyrim.nexusmods.com/mods/14134#content
I haven't figured out how to customize the textures for OpenBooks yet, but I love the "look" it gives to my house. And you can use the General Stores mod as a resource without using the ESM, which for personal use, is fine but if I release my house mod, I will switch to using the ESM as so many people really like the universal access.