Xero set up for small business

Set up of Xero for small business.
Current finances are in Waveapps (2 years to 31 March 2018). As a minimum would like balances transferred to Wave for the 2 year ends, customer data (5 in total)
Transactions in Wave from 1 April to current to be replicated in Xero (so Xero will have full financial year). For this period there is 1-2 sales invoices a month and up to 20 expenses.