First port of call, is to log in to Dash4Its main website, and buy both the Explorer and landranger OS map of your area.
Even without any knowledge of ones locality, when can look at the maps, and see whats on offer.
Do not be worried about getting lost, as long as you have told someone roughly where you have gone, and you have a mobile phone handy, getting lost will be an adventure in itself.
Its obviously better to walk in company, but some of us prefer to go it alone, which includes me.
Get your latest OS maps, and plan a route that looks exciting.
Its ever so easy to stay at home thinking about the great outdoors, and however short your first number of walks turn out to be, your making an effort.
Go for it, and have a great time in the process.