I want to attract the best possible tenants, so I have painted, laid new carpet, and new bathroom light fixtures, but I am curious when upgrades becomes non profitable.

Ok, so an ARV of $1.9M and let's assume $75k for rehab for new paint, new kitchen, and likely some higher end upgrades to fixtures and landscaping to dial this in.

In fact what many of them do is slap cheap carpet and paint and change a couple of fixtures and call it new.

Let me know when ur available for a cup of coffee.

Extremely ignorant in the Real Estate field "(an empty cup they say)" and experiencing what Bigger Pockets has to offer me.

I did some research on a new build a few years ago as I almost purchased a piece of land in San Rafael and I was getting prices between $300-$350/SF for a modern looking house without fixtures and appliances. 

Buy them the first 32 ounces of concentrate that comes with the measuring cup, show them how to measure and apply, and tell them they will have to buy the next container of RoundUp.  

Cabinet Pulls/knobs Countertops Sink faucet Toilet Bathtub Showerhead/tub spout/valves Bath shower/tile Mirror and or medicine cabinet Other Bathroom fixtures i.

, take out tile/replace with hardwood, countertop, open wall to living room (Just a window, not a wall demo as its load bearing), and new (or used) oven New interior doors Bath: Tile, vanity, countertop, toilet, reglaze tub Light fixtures, vents, plugs, switches Staging Potential updated electrical box (currently in good working condition) NEW LARGE window in living roomInvestment180K current20K rehab20K & closing costs realtor fees220K CostThere appears to be a possible 20K gain on my primary residence, this would free up approx. 30 – 50K cash to be used to jumpstart my real estate investing career.I have not gotten quotes on the repairs yet, this is what scares me.If repairs end up costing 40K, it could eliminate the entire gain and I would be better selling now to pull the cash out.Please provide any and all thoughts/advice you may have regarding starting my real estate career.Thank you in advance for your response!

Don't do it don't do it don't do it.Redoing the floors and getting a modern lighting fixture in there should be enough to make it quite attractive as a rental.