Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh
Once a person enters Paradise, and inshallah we will, they can ask Allah for anything they want. Keep in mind that Paradise will be such an amazing place that we will probably not ask for the things that we think we will want now. Since we have not seen Paradise, sometimes we think that we hope there will be rainbows, chocolate, fancy cars, etc. However, that is only because of the luxuries we experience in this world.
In Paradise, the things we are given will be so amazing that we may not care about the other things that we loved in this world so much, since they do not compare.
As for how a person will enter Paradise, this is up to Allah. We must strive to be the best Muslims possible by fulfilling and exceeding all expectations.
Almighty Allah knows best.
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