Hello,
Abit about myself, I'm a graduate from the University of New South Wales and have over 6 years of accounting experience. I am working as an accountant for a corporate service provider here in Hong Kong and use several accounting systems, one of which is Xero (Certified).
About your business, first, you will need to know which plan when purchasing Xero since there are different plans (USD40 / month with multicurrency, USD 30 standard no multicurrency etc.) I usually suggest that all our clients use the USD40 / month plan as it is usually the case that more than one currency is used in the business (e.g. the most common USD and AUD).
Also you mentioned inventory in your description. Currently Xero is working on an inventory system which is due to be completed by the end of this year. I will be able to help setup a simple inventory system. However, if your business grows quickly, a third-party add-on such as tradegecko maybe requried to suit your inventory needs.
If you would like to talk more, I am available during after-work hours and on weekends.
Thanks and hope to hear from you soon.
Regards,
Lewis