I pay them interest-only payments allowing me to maximize cash flow.

I am planning to evict a tenant in Arizona.

While secondary market loan servicers do not really intervine when a problem poped up, we did, to the extent of paying off any loan or obligation or restructuring it.

Long story short, they recommend a process that basically looks like...Soil scientist --> (septic engineer IF needed) --> site plan --> county approval...We've spoken to a few soil scientists and they all quote 2k-5k to analyze the property for an appropriately sized septic system. 

A few thoughts on that plan:1.

It may sound nice to pay a 6% management fee but the extra fees can add up to be more than the other company that charges 10% with no additional fees.

Would it be worth paying a mentor for guidance on structuring the LOI and analyzing the finances together.

I don't know a ton about tax lien investing but my advice for note investors is to be selective as to when you order title reports (can get pricey if you run too many), but it can be wise to pay a bit more (two-owner search, for example) for a more thorough search for those assets you are likely to purchase.

Unless you're paying cash, your monthly motgage payments are going to be so high that it will take a big hit on your Profit and ROI, right?

We planned to sell, but our agent gave us another option - he had a husband and wife who didn't have the credit to purchase and would we consider renting.