golf balls?

as a newcomer to golf rather than going out buying a load of golf balls i decided to go to the beach near my local golf club and search.
I found about 15 balls, however they are of various types, am I better sticking to one type of ball? whats the differnce between ball types?
In what way are balls marked practice inferior?(got about 6 of these)
are balls labelled pro V1 and then a number different to Pro V1x?

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