I don't know the program Producer. But there is one thing you would need to be careful about with slideshows which include video whichever program you are using. That is to ensure that the slideshow itself (which of course is converted to video) uses the same Field Order (Upper Field First or Lower Field First) at the video you include in it; and only to use video which has one or the other Field Order...
I always make my slideshows (which usually don't include video clips) Frame Based (i.e. neither Upper nor Lower Field First). But if you do that and include video, then the video will only play correctly on a computer monitor and, normally, also on a high falutin' modern digital TV which uses progressive scan (akin to frame based). If you yourself have an older type of TV or intend distributing your masterpieces to friends and family who have such TVs, then you have to give your videos, and slideshows which include videos, a Field Order. Photos can take on the attributes of either Field Order, so that is not important.
But if you use video which started life with Upper Field First, then you have to maintain Upper Field First throughout the project up to and including the burning process. That is Golden Rule Number 1 of video editing/authoring. If you change the original Field Order of video, then you will get various artifacts enter the picture quite literally. Common problems with wrong Field Order are jerky motion and jagged edges (known not so affectionately as 'jaggies') on straight lines during rapid motion or panning shots.
And Golden Rule 2 is: never mix Upper Field First video with Lower Field First video. A final video can only have one field order. But if you mix video of the two different types, then one or the other will be jerky or have jaggies in the final DVD.
Incidentally, to find which Field Order your 8mm collection has been converted with, open one of the captured mpeg-2s in Video Studio -- either in the Library Pane or in the timeline. Right click on it, and choose Properties. If you like, you could posts all of the properties here as it could be helpful if you later run into problems with a slideshow should you choose to try making one with Video Studio.
PS: I have just downloaded and leafed through the 232 page user manual for Photodex's ProShow Producer 3. Wow -- looks like quite a program, and all that, just to produce a slideshow!!! At the same time, however, I could not find any reference to the Field Order questions I mentioned above, either in the body of the manual as I admittedly only flicked through it, or in the index at the back. The Chapter on DVD creation also does not mention it.
And a further footnote -- don't worry about the Granddad business. Not everyone on this Board is a young 'un!

I am 58 for instance, and only started video editing about 7 years ago with VS7... And I suspect there may be others amongst my colleagues who are even older!! (And while not a grandfather, I am at least a granduncle several times over!)