How and when to create a fact table

hi every1,
I am new to oracle and specially to Data Warehousing. I am using OWB 11g on windows XP.
I have created the dimensional for a database, now i am in the implementation phase.
i have the following questions.
1. I don't know how and when to create a fact table. I have already created the dimensions (ROLAP).
2. Do i need to create a mapping for a Cube. if yes, then how to load them from 4 different dimensions. how will be the join condition, they don't match?
3. I will also try for aggregation, do i need to use MOLAP for the dimensions or ROLAP works?
Please, give a quick reply.
regards
RF

You should ask your question here:
Warehouse Builder
where it is on topic.

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(     s_id
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Well basically what your saying is absolutely right
I realized what i am doing right now is stupendous blunder.
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        74 B          a                 100
        75 C          a                  80
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        78 F          a                  20
        79 U          a                   0
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