First i marry the Byzantine Emperor's daughter to secure an alliance with the Empire. Then i claim and annex the independent counties around Napoli. Then i'll go for Sicily against the muslims. When i have a little Italian land and the whole island of Sicily i will push out the Normans from Italy, and later expand into north africa. After that i will slowly secure the northern regions of Italy. All will fear the new Greko-Italian Empire.
Hope this plan works out.
good plan. remember you can inherit land by marriage too...
you'll have to tell us if you succeed in your plans in an AAR