If the formula isn't RE=$=FUN than the numbers don't work for the deal.

As for how much do I want to make I have this formula...Beginning buying plan: Maximum Offer (MO) = 65% of ARV - Minus Repair Costs.Budget: up to $200k which includes holding, purchase and rehab.So in theory if everything went as planned I would make 35% we all know that's in a perfect world if everything went just right.

Just starting out, I would love to have some answers or formulas for this questions.

What other questions should I be askingJust starting out, I would love to have some answers or formulas for this questions.

The standard formula that many use in flips is (ARV*70%) - Renovations = Purchase Price.

I really like spreadsheets and using formulas, but I know someone has created something that will make this part of my job much simpler.

The problem with using tools to estimate income is 'system' or 'formula' has no idea what your STR is going to be like. 

If there was a straightforward, easy-to-follow formula to real estate investing that would guarantee success, oh, trust me, any one of a thousand gurus and advisors would have shilled the hell out of it decades ago.

Good question, Typically Using simple interest formula 

I Have been Following The Approach Of Dave Ramsey With his Baby Step Formula.