Lets start with the LLC question. A competent real estate/corporate attorney can get you all set up with your LLC or LLCs, its pretty straightforward (despite seeming overwhelming at first). You will need to form the LLC and then transfer the real estate into it (probably no transfer tax, but a new deed will need to be done). An LLC is pretty straightforward to operate. Think of an LLC as its own entity separate from all of your personal affairs. It should have it's own bank account and accounting. One of the major benefits of an LLC is asset protection. If you commingle (mix) assets (like cash) you will lose that protection in the event you are ever sued. Remember- the LLC will own the property NOT YOU! Everything goes in the LLC's name. Rent gets paid to the LLC, insurance is in the LLC name, the LLC enters into contracts with contractors, ect. Paying yourself out of the LLC is completely ok and simple. For tax purposes the LLC's income or loss flows directly to you so whether you take the money out or leave it in the LLC you pay the tax personally. One other consideration to discuss with your attorney is if you should or want to have an LLC for each house. This would provide the best asset protection.
On to financing. Outside of conventional bank loans you have several options. One of the more popular options would be a line of credit against the equity in your personal home of the homes in your LLC. Other than that you have the hard money lenders if you can stomach the high interest. Also, don't forget about the creative financing options. You could have the owner hold a purchase money mortgage, you could partner with someone who has cash, buy an home with a retirement account, ect.