topics / language issues

Hello,i just started learning chezch and my studybook really misses some topics like shoping and stuff
so can u please tell me hot to spell this phrases in chezch ,-
I would like to buy this?
Do u have "("biscuits" for example:p)"in stock?

Thanks.

funny question.
You can ask: Máte sušenky? 

sušenky, pronunciation: [su-shen-ki] = biscuits
máte, pronunciation: [ma:te] = do you have

I guess that every shop almost anything and there is no need to ask if they have it or not.