It has several major advantages over an IRA, you can learn more here:https://www.biggerpockets.com/blogs/2810/21298-sol...However, Solo 401k is not for everyone.

I have found blog posts from neighbors complaining about the property, that it has been foreclosed on, is an eyesore, vacant, etc.  

So having an SEO optimized website, doing Pay Per Click ads, blogging, video marketing, etc.

Read the blogs. 

Also, to "toot my own horn," please read my BP blog article about Valuation of Rental Properties, at https://www.biggerpockets.com/blogs/6547/51598-val...At the same time, develop relationships on BP for people who can send you leads, submit properties for your consideration, or partner with you on deals.Denise

I try to listen to at least two podcast per week in addition to reading the Blog. 

You can listen andfollow the “BiggerPockets and the #AskBP podcast, and the forum and blog.

I would read every BP blog post and listen to every BP podcast about apartments.  

Because adding in a modest 5% buffer for vacancy, the 10% for your property management, and maybe only 8% for maintenance.5% Vacancy: $1800 annually    /   -$150 monthly       10%  PM: $3600 annually         /   -$300 monthly8% Maint.: $2880 annually        /  -$240 monthlyMortgage, taxes, and ins

Check the recent BP blog posts.