I'd say that the resources needed are.
Coal, iron ore (preferably 2 types but could work via a tech alloing new iron deposits to be used), wood, cotton/wool, oil, other metals (copper and such), foodstuffs this would be the basic things.
Then by combining them you can get steel (from iron and coal or wood), textiles (from cotton/wool), fuel (from oil and maybe coal), machined goods (from Steel, wood and other metals) and weapons of some sort (from steel and maybe other metals).
To build warships you would initialy need wood and textiles and weapons. Later on you would need steel and other metals, when the guns became more uniqe afterall noone made 100+ exctly the same 12" guns for battleships.
Well it's an idea at least
