Sync Documents Folder without cloud iPhone 3G

First off I'm brand new to the iphone ive been using android for the last 3 years in which this process is very easy but im having the worst time trying to figure out how to accomplish this task. I have a documents folder with a ton of sub folders & files that I want to sync or just import to my iphone without a cloud service & without spending hours importing each file. Sorry in advance if this is an easy task & I look stupid for asking but ive tried searching & cannot find a answer.