I am looking for another agent to hit the pavement with me to generate leads.

If I were to advertise my vacant land, I would do that ground work for them (but its time consuming) Call the utilities and ask how much each one costs to connect, then get estimates to put a gravel road/ asphalt road/ cement road.  

The most important thing is to take action right away and be consistent with your marketing message and frequency.Website and Online MarketingDirect MailDriving for DollarsPounding the Pavement (door knocking, yellow letters, call me post-its)Check Public Records (Tax, Probate, Bankruptcy, Divorce)CraigslistNetwork with REI, agents, brokers, inspectors

Since I needed some asphalt work done on a side roof anyway I just had the whole thing replaced.

Talk to people in the neighbourhood....simply ask them "do you happen to know what rents are like around here".A bit of time spent "pounding the pavement" and you should have a pretty good idea about rent.  

With any other business, you must spend money to earn customers.A contractor can consider giving estimates as his investment in earning new customers.You won't get any customers if you aren't out there beating the pavement making the sales...

Cost of constructing 24 feet wide 700 feet in lenght asphalt road?

Target size strip malls, or office space, or NNN, or Pads, or etc...Or are you talking about things like a stand alone building with a hair salon, or similar in it along side of a major road.[2] What can you afford to do Down-payment-wise, in an MMA maybe only a 7/11 strip mall, in a medium sized area maybe a larger bite of the chocolate bar than the 7/11 mall.[3] Do you want partners on deals, (same on all, different on some), must you have partners on deals (loan qualifications, personal weak spots, etc...)[4] How will you swing the bat at financing; do you qualify for the financing your deals will need, will you need others to help you qualify, do you now these people vs risking someone who will make your life miserable and you will hate working with (an unfortunate situation). [5] Do you want to work government handout money for fix up real estate, is there any that looks profitable right now.[6] How well do you know commercial real estate "Stuff"; such as can you identify a 400 amp service panel from an 800 amp service panel, can you identify an electrical transformer that you own from those owned by the utility, what is a plenum, does your building have them, what are those big red pipes with wheel handles on them, hidden behind the bushes (who do they belong to), how long does asphalt last in a commercial lot, and etc...Good Luck!

Hardy plank siding.. asphalt roofs. 

@Dawn Young - Sorry for all the posts but I wanted to add to your list of possible expenses:Engineering Fees, survey, local entity's application fees for development, building permits, parking lot paving (some areas require pavement rather than gravel), stormwater permit fees, stormwater ponds (the design is included in the engineering fees), underlying soil corrections if your property is on peat-y soils or poorly drained land, wetland delineation, building structure engineering, worker's comp insurance if you hire someone (probably not in this scenario), legal fees for an attorney to write/review your lease, legal fees for attorney to guide you through the process of eviction (often called a 'lien sale' in SS circles), landscaping buffers (yes, I've had to install trees to buffer vehicular traffic - that reminds me, one of those trees are dead and I need to replace it.