Best all-in-one software

[Brandon Roof]

I am attempting to get all ducks in a row prior to purchasing my first investment property.  I will be looking to self manage and I am in need of assistance identifying to the most comprehensive software option.  Applications, tenant screening, signing of leases (and all other applicable forms), tenant communications, rent collection options, accounting of revenues and expenses, maintenance requests, assistance with tax filing and other required documentation, the whole deal.

Taking price into consideration, what are the best options going to be for somebody who will be managing 1-4 units with no experience and limited knowledge?  Thank you to all that can provide guidance.