Getting a report like that should be fairly easy.  I'm not tracking lease information right now, but if you look at this Article i wrote a while back it might give you somewhere to start. 
https://www-secure.symantec.com/connect/articles/asset-report-writing-tips

I've been trying to educate some of my teammates on writing reports as well and it can be trickey to start with, but once you understand the basics of the database it's fairly easy. 

Someone else might have a better way to do it, but here's another breakdown of what I've been doing.  This does take a little bit of SQL knowledge, but not much.

Each item has a "Guid".  Items in your case would be, computer, User, Cost Center, and maybe Lease (if those are tracked as contracts instead of Data on the computer)

Each item has "Data Classes".  Each data class is one Table or view on the Altiris database.  Those tables all have the "Guid"  for the item listed on them.  If you want information on one particular Type such as an inventory report might give you, you'd just JOIN on the appropriate "Guid" columns. 

Items can also have "Associations" such as "Cost Center" to "Computer".  These relationships also have their own guids and a table linking them.   So when you're associating the "Cost Center" to "Computer" in your report you need 3 things to get to the Cost center's information.  The Computer's Guid, the Cost Center's Guid, and the Association's Guid (also called an Association Type).  This is all stored in the "ResourceAssociation" table. 

Like I said before it does take some SQL knowledge, but because each database structure can be soo different (especially once you start using Asset Management Solution) it can be hard to get you that SQL directly.  Hopefully this helps you out at least a little bit.

I almost always use Full outer Joins and then Limit using my Where statement. It's just easier to read.

I don't have an NS in front of me now but your SQL will look something like,

Select table1.Lease_Schedule_Number, table2.[start date] - ETC.
--- Start Date needs to be bracketed because there is a space in it's collumn name.
From Table1 T1
Full Outer Join Table2 T2 on T2._ResourceGuid =T1._ResourceGuid
Where --- whatever.

A great resource for learning the basics of SQL is W3Schools.Com
http://www.w3schools.com/sql/default.asp