The lender just doesn't want a EPD (Early Payment Default) on the loan if they sold it to a loan buyer like Fannie/Freddie.

Biggerpockets sells a Lease Agreement Package under "TOOLS" at the top of your screen. $100 for a lease and several other documents, written by investors and attorney approved for your state.

Is there any online services/tools where I can do the above DIY?

My spouse and I have bought and sold over 20 properties in the Atlanta area over the past 35 years.

I don't know anyone who has bought or sold via classifieds here although I am sure it happens.

In order to defer all tax you must purchase at least as much as your Net Sale(contract price, minus the closing costs and commissions) and use all of the Net proceeds (the net sale, minus any mortgage payed/ Equity in home being sold).  

Then once sold, the listing agent would be getting their cut of $36,250.

the first property I purchased was in Cleveland back in 2005 a single family that I purchased for  22k cash and i rehabbed it after work and on weekends this property was in the hood I put 12k in it put a tenant in and sold it for 79k to investor who an real estate agent referred me. 

Is Free and 100% network no sales you network you do the sale by either asking for capital or bringing your deal to be sold. 

But in order to successfully do a 1031 exchange you must purchase at least as much new real estate as you sold.