The Woodland Trust identifies three phases of development:
Years 1 to 4 are the establishment phase.
Years 5 to 9 are the post establishment phase.
Years 10 to 50 are the long term management phase.
Thinning, felling and coppicing is expensive so where it is necessary the cost is likely to increase. However, this is part of the long term development.
Maintenance of structures such as varnishing sheds and benches is relatively inexpensive compared to other aspects of creating your woodland.