As you set out on this literary London walking tour (which honestly might be a bit ambitious to do in one day), you'll want to look out for these blue (or sometimes brown) plaques scattered around the city. Since 1867, the plaques, in various incarnations, have marked landmarks associated with influential political and cultural figures.
You may search for a particular author's plaque or plaques on the English Heritage website, or just keep an eye out for them. Within blocks of this T.S. Eliot plaque at 3 Kensington Court Gardens, for instance, you can see the former residences of Ezra Pound (10 Kensington Church Walk), William Makepeace Thackeray (2 Palace Green), and James Joyce (28 Campden Grove).