Can someone please help me to translate?

can someone teach me how to say...

''I want what he's having''

''May i get 5 random items''

''I have (X) amount of money, i would like to spend can you give me food of your choice for that amount''

for ramen how do i ask for the bigger portion...

May I assume that all those phrases are for use in restaurants?? Otherwise please give the context, because the wording can be completely different.

''I want what he's having''
- Ano hito to onaji mono wo onegai shimasu. (I'd like to have the same thing as that person over there.)

''May i get 5 random items''
- Go-shina mitsukurotte kudasai. (Please put together five items as you please.)
You are likely to be asked for your preferences, I'd say.

''I have (X) amount of money, i would like to spend can you give me food of your choice for that amount''
- X-yen arimasu. Kono kingaku inai de, tekitou ni erande moraemasu ka. (I have X-yen. Could you pick some things up to this amount.)

for ramen how do i ask for the bigger portion...
"big portion" = ohmori