You lucky person you! Look up British Trust for Conservation Volunteers, Natural England, even National Trust in local directories and one of them will let you know what courses are on where. You can go on cheap short holidays too. A course on bladed or small tool use and/or power tool/chain saw use will teach you a lot. A local wildlife society will be found through your local library and joining that will give you all sorts of free knowledge, labour, a survey of your wood and so on. The ponds may be horrible and take a buddy whenever you do any work if you can.
What you do may effect the microenvironment. The ponds and thinning trees may mean you have planty of water for a hedge and so on but it is a consideration, plus where the water comes from. Spring, dew or just accumulated? Does it need enhancing or draining? How old is the wood, does it have banks round it and what was the original use or intention? Do you know what grows there normally before you go planting bulbs? The local groups will help you find out.
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