Building a large shed can seem like a project that needs to be built by a professional shed builder, but many DIY folks with little experience have done it themselves.
Most often than not for a large shed like a 12x16 will require you to get and obtain a permit to build it.
The first thing is to have a plan, you can see the free plans and free PDF download for 12x16 shed plans here - plans 12x16 shed - see the image below, image credit goes to Construct101.
This shed has one small door and a larger double door on the side. If you need a place to store your lawn tractor or atv's this shed offers the space needed.
Other great uses for this shed can be a small workshop, or an office.
To see if this is a project you can undertake visit the site and look at the many step-by-step details with plenty of illustrations.