We are purchasing a 6 unit Apartment building in a small central Texas town. 

Hi Angelica, I would look for a local meetup - there is a meetup section under "build your team" at the top of this site.

As for a tax professional - you can find those under the "Build Your Team" tab in the Navigation bar of the site. 

Both of them are by the bedroom and this new one I just completed a master bedroom build added on to the back of the house with a private entrance for myself so I’m currently renting out the other 3 beds.Which cost me thousands more than I expected due to contractors not performing like I had expected etc etc.

My W2 income is >$550k/year, if I build an RV/Boat storage facility, will my storage business expenses/losses be able to reduce my W2 taxable income? 

That's far from a definitive answer because its an owner occupant and a single family, but I would imagine if you e-mail the house/building department they should be able to give you a firm answer.  

If I use seller financing to own a property, do I build equity even if I sell before the mortgage is paid off?

Look at ways to pay, build a team, start with something small, check everything carefully, move forward, and keep going even when it's hard.Begin with a small property or an easy project, aiming to learn by doing and slowly grow your holdings.

They are all about 10 feet apart.

You may want to see if the limit for the Building increased or if it is just a straight rate increase.