Hi Michaelo,
The beauty of Method is that your leads and presales activities do not need to be in QB first. If you entered a customer record in QB first, then the "contact Name" (first name, last name) as you set it up should appear in the dropdown list in your Opportunity table. This is "Contact" in Method. When you enter in a first and last name into QB ("contact name"), QB fills in "Customer Name" and assumes that will be your Customer name. But it doesn't have to be - you can change it. However, "Customer Name" needs to be unique. Method works the same. Other Data you enrered into QB for this opportunity should be in Method under the Customer tab. The above is important if you have a Contact with more than one "Customer". Opportunities and Activities in Method are built on relationships, so the Contact (the person you are dealing with) is the important and relevant piece of information.
Set up the Opportunity in Method first. If a new name, then add a new lead record and in the New opportunity screen choose the Contact from the List. The Opportunity Contact dropdown includes both customers and leads. When are ready to close the deal and generate an invoice. Method will convert your "Lead" Customer to a "Customer". This sends the customer information to QB..... You can also manually convert a "lead" to a customer from Edit Lead. Other Actions button.
TimeTracking IN Method will recognize a Lead or Customer in the Customer/Job name dropdown. This is the Customer Name as opposed to the Contact. Only the Customer records will go to QB. Method does have some time tracking reports in Method Report Designer which you can use. If you want your presale time tracking to go to QB, then you could set up a JOB for the oportunity under a CUSTOMER called "Leads" or something like that... Or under your company name. This way, all you "opportunities" are in one place and not scattered among the time tracking for real customers. Then close the job when opportunity is closed. Its more work and I would only do if you really need the Time in QB.
Hope this helps. Sounds like you are on your way... If you need some more help, get some consulting time with an MSP or from one of the Method Consultants. It can save you a lot time.