I've had a lot of large repairs in the past year that just kill the cash flow.

Handle a few properties for other owners, minor repairs, find new tenants, and rake in 10% .

I guess it's just too many factors to consider and it easy to get overwhelmed and cannot get accurate info and estimation when I conduct analysis (ex. property tax rate, insurance, maintenance fee, rent, repair, closing cost, etc.) 

Quote from @Alecia Loveless: @Natalia Perlova Absolutly no to the Sunday repair.

In a text book case you'd buy a property for half of its ARV (after repair value) and then spend 25% of ARV on rehab and generate 25% equity.

Make sure when the new hardware is installed adjustments are made if needed and repair any damage to door jamb. 

Though my property management company eventually took care of the eviction proceedings and repaired the property to prepare for a new tenant, I feel they were negligent in their duties.

Renting out mobile homes can be a great source of cash flow but they’re notorious for being damaged significantly by tenants and tend to need a good bit of repairs before renting out to the next tenant.

Budge for unexpected repairs.

If it's not you - you are going to be paying contractors (most likely) retail repair rates - and with the prices of housing (even dilapidated housing) pretty high right now - I would say that flipping is not the easiest "in" to the market.