MS-CRM-Console application

Hi Everyone,

How are you.

am new to Microsoft CRM , 

wrote one console application

Q1)which we retrieve all bill-ID's from billing  entity(kcd_billing details) and send  all bill id's  to third part service  and will get response from  third party service ..

1.a)after i got response from third party i need to  check bill-id  is exist or not in lookup filed (kcd_billing) of entity credit risk ( kcd_creditrisk)

i don't no  syntax of xrm ,how to check :

please help me with sample code or syntax..

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Q2)am not able to create record with with values ...below code is creating empty records in entity 

please help us sample  code to create record with values

Entity creditrisk = new Entity("kcd_creditrisk");

creditrisk["kcd_revenue"] = revenue;
creditrisk["kcd_billing"] = billID;
creditrisk["kcd_security"] = security;
creditrisk["kcd_month"] = month;

service.Create(creditrisk);