Accounting - Sage Accpac to Xero Conversion

Xero account has been setup, and much of the conversion has been done (importing chart of accounts, posting monthly Trial Balance amounts). We are struggling converting bank account transactions, importing purchase and sales ledger to match transactions previously processed through Accpac. We want to ensure VAT amounts imported will match those previously posted and claimed / declared on the accpac system. We'd like someone to be able to convert accpac data/backup to produce supplier & customer invoices to a Xero ready for import CSV format. We also like an expert who would be able to write some custom reports using the Xero API for producing customer specific VAT reports and others on an adhoc basis