Quote from @Enrique Toledo: I came across a really good seller financing deal and I would like to purchase it as my first deal but I don’t have enough money for the down payment.can I use a lender of some sort to give me money for the down payment?

Step 1: Ensure you can get financing (is it a cash purchase or will you need a loan). 

So pretty good equity position within a year plus cash flowing well based on a $325k purchase price.

Purchase price: $450,000 We bought this park for $450k.

You are not allowed to compound interest.If you bought the certificate from the state on a best price offer, you charge interest on your purchase price, not on the full amount of the taxes that were due, but were not paid by you when you purchased.After you obtained your tax deed, you are entitled to something called "mesne profits" if you file an ejectment lawsuit against the former owner and they redeem during that lawsuit.  

Let's assume the financials in the package are good for a moment (they probably are not) AND that you either do not or do achieve the broker's pro forma:If you purchase this asset, achieve ONLY the 'current' NOI, grow NOI 2% per year, and exit at a 5% cap at the end of Year 6, you will have a 4.8% unlevered IRR. 

I’ve isolated these three markets as they’re all within driving distance from my home and seem to fit my budget of $100K-$200K for purchase price.

I can lend up to 100% of the purchase price and 100% of the rehab costs for experienced investors on 1-4 unit properties.

Purchase price: $230,000 Cash invested: $200,000Two homes on half an acre.

I was able to qualify for about $95k in 0% business credit cards (for 12 months), I then liquidated the cash and used a portion of that to obtain the hard money loan that covered the balance of the purchase cost.