What effect will that person being in the apartment with Ebola do to the prospects of renting that unit in the future, will it need to be disclosed?

I'm also not an 'expert' on this REI stuff, by any means... but 'market cycles' are 'predictable' in the sense that the same people control them and pray off of the 99.9% like clockwork... and as many an 'insider' have said, in effect: "Watch what the herd is doing... and be prepared, then do the OPPOSITE."

However i want to buy my very first home via first time buyer, i dont have money for a down payment and i dont want to make this decision effect me in my  real estate investing.

http://www.biggerpockets.com/renewsblog/2014/10/03/the-beginners-guide-to-highly-effective-real-estate-networking/

http://www.biggerpockets.com/renewsblog/2014/09/30/14-effective-pages-for-a-fully-optimized-lead-generating-website/

For example, city of Austin has some rediculous energy efficiency requirements as well as ever-changing codes that take effect on properties with an ownership change regardless of how old the building is. 

Karen, you take away the legal and illegal immigrants effects on population and we would have had been losing population since the mid 80s.

I don't mind if a tenant works from home as long as that work does not create any strain whatsoever to maintenance of the property, or cause inconvenience, noise, and liability to anyone else.For example, buying and selling stuff, requiring UPS or FedEx multiple times a day for pick up, drop off, sometimes many packages on doorsteps; running a misery, conducting a yoga class, hair and nail, pet grooming, are all going to have frequent visitors that may park in neighbor's parking spaces, and you might be liable if a dog being groomed in unit C bit a baby being dropped off for baby sitting in unit B.  

Is it worth trying to groom an inexperienced agent for your needs?

No effect on taxes at all, unless you elect special tax treatment.