Rather than wasting it or leaving it in a bank account I'm interested in starting my own investment business to supplement my real estate sales. 

I am looking to expand my business and wondering what marketing tools others have used to grow there portfolios?

Quote from @Gian Pazzia: For properties that small, you should budget $450 per property and use software like the one below from a trusted brand that has been in business almost 25 years. 

Yes, it is in my business name @Christopher Phillips

Hey guys, I'm Mert, a new real estate agent in NJ, navigating the real estate business as a true beginner.

Check your local and state regulations regarding this business model.  

I no longer qualified for traditional financing because I already own many rental properties and my DTI was high for the bank, so I purchased these in a business entity with a trusted private investor and was able to refi the 1st property/sell the 2nd property to pay back my investor and ultimately keep the better property for zero money down.

Do NOT do business with Deal Machine or their affiliates.

Many OOS investors set themselves up for failure because they don't invest the time to ACTUALLY understand:1) The Class of the NEIGHBORHOOD they are buying in - which is relative to the overall area.2) The Class of the PROPERTY they are buying - which is relative to the overall area.3) The Class of the TENANT POOL the Neighborhood & Property will attract - which is relative to the overall area.4) The Class of the CONTRACTORS that will work on their Property, given the Neighborhood location - which is relative to the overall area.5) The Class of the PROPERTY MANAGEMENT COMPANIES (PMC) that will manage their Property, given the Neighborhood location and the Tenants it will attract - which is relative to the overall area.6) That a Class X NEIGHBORHOOD will have mostly Class X PROPERTIES, which will only attract Class X TENANTS, CONTRACTORS AND PMCs and deliver Class X RESULTS.7) That OOS property Class rankings are often different than the Class ranking of the local market they live.Class A is relatively easy to manage, can even be DIY remote managed from another state.

To be regarded as a real estate professional, you must perform a substantial amount of real estate business, defined as more than half of your time, and at least 750 hours, spent in real estate trades or businesses.