Contact organizers, tracking system, invoicing

A client wants to do the following:

1. from their website orders for books come in via and e-mail form
2. they want to be able to import the form data into some sort of software 
that will allow them to a) prepare invoice; b) prepare mailing label; c) 
keep the contact for future on-line and/or off-line marketing; d) import 
the data into accounting software
3. they also want to be able to enter any data from previous purchasers on 
books (prior to going on-line) to use in the future
4. capture e-mail addresses of visitors to their site who write them e-mail 
for future marketing
5. my question is - this sounds quite feasible and surely there must be a 
way to easily import/capture information into some sort of database that is 
simple and cheap.
6. the client handed me a copy of Maximizer 3 contact management software 
and said they thought they could use that - I don't know the first thing 
about this piece of software....does anyone have experience with it? Could 
anyone recommend solution that is quick, cheap and easy for the client to 
learn/implement?

Any input, advice would be appreciated.

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