Well if nothing is easy there:
City may have some stiff requirements:
Property may need to be rezoned to a zoning classification that fits your proposed lot size. They may request that the existing house be included in the rezoning/subdivision. Zoning has building setbacks and other requirements that need to be followed. Rezoning would probably require a preliminary meeting with city planning staff, an application and fees, and one or more public hearings.
Then they may require a preliminary plat. This is a subdivision plan showing lots, their dimensions, maybe existing topography. You would need to hire a surveyor for this. This plat gets submitted to the city (with fees) for review.
The surveyor would also prepare a final plat showing lots and their dimensions, proposed easements, and signature blocks for all entities that need to approve the plat. And also stake the lots. Final plats usually go through the public hearing process. After the plat is approved, all signatures must be obtained.
The city may require park and school donations on a per lot basis as part of the final plat process. In addition to application fees.
They may also require public improvements as part of the submission process. These include sanitary sewer and water utilities (or service lines to existing utilities). Street widening and sidewalks could also be required. Maybe storm sewer. Possibly a storm water detention pond (I doubt it in this case)
You would have to hire a civil engineer to address these issues and prepare a set of construction plans for the improvements. The city may require a bond for these improvements. And the city may charge the developer for the city consultant to review the plats and plans.
Once the plat and plans are approved, the city will sign and approve the final plat. Once you obtain the remaining signatures, the plat is recorded at the county recorder of deeds. At this point, the lots can be sold, with deeds having legal descriptions referencing lots in the recorded final plat.
But this is not the end. The developer needs to hire contractors to install the improvements shown on the plans. After the improvements are installed, they must be approved by the city - then the bond can be released.
Developer has to get electric, gas, telephone, cable utilities. These are generally not shown on the plans to the city.
A few other things to think about:
Any part of the property in flood plain or wetlands?
Will the City go berserk if trees are to be cut down as part of the development?
Any reason to believe that neighbors will oppose the subdivision and rezoning?
Any title issues on the current property - easements, liens, mortgages, etc.
This is generally what I went through for a typical city subdivision. My advice would be to go talk to the city planning staff to see what they would require for your subdivision.