Keeping in mind this can vary widely: I would say seller financed interest rates would generally be above standard bank rates yet lower than hard money.That is the question asked.

Here is what I was taught a good comp should be:- 6 months of sales-  +/-200 sqft of subject property (1,000 - 1,400 in this case)- 0.5 miles from the subject property- same ba/br or close to it and adjust- do not cross major boundaries such as a different city, freeway, major road, etc. because local markets vary significantlyI'm not happy with this person using 12 months of sales data, but okay I get it.  

For your first deal or two, it's nice to be able to have a short drive to go and look at the property in person and not rely on a PM (Property Manager) do to the job.

In some areas it can even vary by county.

Rather than rely on the tenant managing their electrical capacity, just put in a separate line.

The way it works, which varies from lender to lender, is you can refinance all your properties into into a single loan, with a refinance up to 75% of Fair Market Value.

The prices vary from $80k-$175k (ideal purchase price so my numbers work). 

Obviously that was indiscreet but all agents want to sell you a property so I wouldn't preclude him just on that basis.I think it's bad practice to rely on any RE agent for rent comps, they are inheiranty biased and likely to highball rent comps in my experiece.  

I know its daunting but you can't just rely on someone to mentor you and show you how to do it.

They do vary depending on the area and type of property.Purchase costs are relatively similar, but depend on whether you're using financing or not.