I am having issues with my landlord, he has locked me out of my rental home. Is he allowed to do such a thing?

No, a landlord generally can't use self help and lock out a tenant. If a tenant doesn't pay rent, the landlord should file suit to evict the...

I was told that I was being taken to court but I never got served and papers I looked on line and I found that I do have a date

If you weren't served and you show up for court at the initial hearing you will likely be found to have waived service. Be careful.

I have reason to believe that the County Sheriff's office aided in a felonious act. How do I obtain dash cam footage?

File a lawsuit and get it through discovery.

False accusation of theft @Walmart class action lawsuit

All people in the US weren't falsely accused of theft at Wal-Mart. You don't have a class.

In Missouri you need to be licensed. http://pr.mo.gov/massage.asp I think you can find a more legit way to earn a buck.

It is not too late. I suggest you find a local attorney who regularly practices in the court where the case was filed.

Collecting last month's rent?

You could sue in small claims court. I'd wait till their out,so they don't trash the place out if spite.

As a salary, exempt worker, can I be required to clock in/out for my job?

Here's an article addressing the subject, http://www.hr.com/en/communities/benefits/punching-the-time-clock---its-not-just-for-hourly-_eak32frg.html

Can an 8 year old medical bill a little over $200 be outside/under a statute of limitations in Missouri?

In MO the SOL for a written promise to pay is 10 years.

How to get last month's rent?

Short of court, you or any attorney could send a letter. Sounds like that won't work, however.