1) Something that you'll just have to take my word for, because the evidence is in Hampshire Record Library and in my memory:

The Parishes of Steventon and Dene were enclosed around 1760, about the same time that Parson Austen got married and was given the advowsons. The enclosure wasn't by act of parliament but by private agreement between the landowners, of which there were only a few (maybe three? I really can't remember.)

2)Now at the time of enclosure it was common to allot a certain bit of land for the parson's use: it isn't absolutely clear whether this actually happened in the case of Steventon and Deane. There were a few acres attatched to the Austen parsonage which may have been this allotment.

I believe parson Austen "rented " Cheesedown farm from his wealthy Uncle Francis. He also had to rely on loans from the said uncle at different times in his career.

Mrs Austen kept chickens, Mr Austen raised sheep for sale. Below I've linked to a small blog that some of us made in 2007, which shows you what his sheep might have looked like...just in case you are interested....I am afraid I never really got round to the chickens....