It's not clear what's being asked, so I'll mostly provide context. Fascist Italy in WW2 is greatly misunderstood.

1939 Fascist Italy was very weak industrially. They were stretched thin and heavily in debt from multiple military adventures. Mussolini ignored his advisors. And they thought they had at least three years before war with France and Britain.

Tanks and aircraft evolved rapidly during WW2

First, it must be acknowledged that the late 1930s saw tanks and aircraft evolve at a hectic pace. In 1937 biplanes such as the British Gloster Gladiator were still front line aircraft. Tanks were light and armor was thin. Pre-war Panzer IIIs, Germany's early war medium tank intended to fight other tanks, had a 37mm gun and 15mm of armor (later upgraded to 30mm).

Which is to say, you can't compare pre-war Italy with wartime vehicles like the StuG III and M4 Sherman. The M4 Sherman design began in 1940 and the first prototype was not ready until 1941. The Sturmgeschütz (StuG) concept began as self-propelled artillery to support infantry. It was only existing German anti-tank guns were found to be inadequate against Soviet tanks in 1941 that the StuG was armed with an anti-tank gun and found to be an effective tank destroyer.

Italian industry

Italy wasn't just a little behind the other major powers, they had a fraction of their industrial capability. Especially when it came to automotive work vital to mechanized warfare. They lacked coal, oil, iron, and steel. Italy was more of an agrarian nation than an industrial one.

The Italian population, being largely unfamiliar with engines and mechanical devices, would need to be trained in their basic use and maintenance.

Even so, Italy was trying to modernize as fast as it could. A large part of its 1939 budget was devoted to military spending. They were developing a modern tank, the P40, but their industry could not produce the thick armor and high performance engines in sufficient quantities. As silly as Italian tankettes seem today, they were what Italy was capable of producing in quantity. At the start of the war tanks were still relatively lightly armed and armored.

In contrast, the Regia Aeronautica (Royal Air Force) and particularly the Regia Marina (Royal Navy) were well equipped and gave the British no end of trouble in the Mediterranean.

Italy's costly pre-war wars

Between World War 1 and World War 2, Fascist Italy was involved in many wars and conflicts which drained its meager resources and scattered its armies.

• 1923 - 1932 Second Italo-Senussi War in Libya fighting the Senussi Order rebelling against Italian colonization.
• 1935 - 1937 Italy invades Ethiopia taking heavy loses.
• 1936 - 1939 Italy supported fascists in the Spanish Civil War supplying small arms, artillery, 700+ aircraft, tankettes, submarines and cruisers, "volunteer" aircrews, and 70,000 "volunteer" troops. All essentially free.
• April 1939 Italy invades Albania in a walk over.

All of this military adventurism and delusions of a new Roman Empire left Italy heavily in debt with vast territories to garrison. Training was limited. Fuel and transport was short.

Überraschung! Germany starts the war three years too soon.

When Italy negotiated the Pact of Steel with Germany in May 1939 they thought they had a tacit agreement with Germany that war was not coming for at least three years. They got six months. Germany invaded Poland in September 1939 sparking war with France and Germany. Still, Italy did not declare war.

Italy waited until June 1940 when the Battle of France was all but over to declare war so they could claim a slice of the pie. With the surrender of France, it seemed Britain would fall shortly (spoiler: they did not). They did not expect to do much fighting in Europe (spoiler: they did).

Mussolini

It did not help matters that at the start of the war Italy lacked a structure to develop and carry out long term plans. Instead, Mussolini was in charge. Mussolini, in addition to being Prime Minister, was also Minster of War (Army), Navy, Air Forces, and later "Supreme Commander of the Armed Forces". The Stato Maggiore Generale (Supreme General Staff) was seven advisors to Mussolini which he freely ignored.

Despite dire warnings that their military was not prepared, Mussolini focused on his Mediterranean ambitions with a sluggish invasion of Egypt only to be sent into full retreat a few months later.

It wasn't until June 1941 that the ministries were unified into Comando Supremo (High Command).