He w to use ATC help

So a few times now flying from San Diego to LAX I make flight plan take off and then contact LaX and this is where things get confusing. So I request radar vectors to Klax and they provide instructions and then maybe they forget about me I end up flying off map. This has also happened requesting ILS and x runway. Can someone write a short guide how to ask for direction or how to comunicate with airports correctly.

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