There are quite a few websites offering advice to landlords, and you could do your own Google search on "advice for landlords" (but, on the assumption that you are in the UK, select the "pages from the UK" option). For example, the following is advice offered by a Liverpool-based website, but is of course applicable anywhere in the UK -
http://icliverpool.icnetwork.co.uk/1100ichomes/lan
dlordadvice/content_objectid=12732319_method=full_siteid=50061_headline=-Practical%2Dadvice%2Dfor%2Dlandlords-name_page.html