For me the pasta with tomato sauce.
po-mo-DO-ro — four syllables, stress on the third. Never 'TOMAto' as in English.
Use 'per me' (for me) when placing your individual order. It is the most natural Italian way to specify your choice.
'Per me' literally means 'for me' and signals your personal selection without requiring a full sentence structure. In Italian restaurants you do not say 'I would like' but simply 'per me + the dish'. It is direct but not rude.
Prendo le penne all'arrabbiata.
I'll have the penne all'arrabbiata.
'Prendo' (I take/I'll have) is equally common — slightly more assertive
Vorrei le tagliatelle al ragù.
I would like the tagliatelle al ragù.
'Vorrei' is the most formal and polite phrasing
Per lui gli spaghetti alle vongole.
For him the spaghetti with clams.
Use 'per lui/lei' when ordering on behalf of someone else
Italian meals are structured: antipasto, primo (pasta/risotto/soup), secondo (meat/fish) with contorno (side), and dolce (dessert). You are not obliged to order every course — but ordering only a secondo without a primo can sometimes surprise the waiter.