What you can do with "real" objects in digital scrapping:
a) scan in item and use it that way on your layout
b) leave a space for item, print your layout and adhere real item to it afterwards, you can scan in item to help with sizing and location first and then hide/delete item prior to printing.
c) keep memorabilia separate in a pocket or separate section of your book
d) do a paper LO for those items
Printing options:
a) Print them yourself by either purchasing a 12x12 printer or reducing your LO to 8x8 and printing them at that size (undo to keep LO at 12x12 after print)
b) Send them to a local printer or online printer that will print pages, there are several sites online that do this
c) Get them printed in a photobook, which will be a coffee table type hard bound book, many sites do this online too.
With your historical pages, I think it would look great in a hard bound book, but if you wanted to print reg 12x12 pages, you can slip them into a top loading book and then do paper pages as well for your momentos.
Sites that print pages:
a) Costco if you have on nearby, people rave over their low price and good quality, but you have to pick them up at the shop. If you use them, get it printed on 12x18 and print 1 12x12 and 2 6x6s, everyone reports that is the best quality, if you do 12x12 page they skew it and isn't as good as the 12x18.
b) Kinkos, Office Depot, Staples, and other shops like that have printing services. Beware of hidden charges, however. I made calendars for Christmas gifts last year and got them printed at Staples, and while 39 cents per page sounded great, they had several hidden charges that I was not expecting, including a fee to take my images off my CD, and it was not a cheap fee. The calendars turned out beautiful, however.
c) There are tons of online sites, most I cannot remember right now, I'm sure others will add more.
www.sbtoshare.com gets great raves on service and quality and low prices.
Photobooks:
www.heritagemakers.com
www.shutterfly.com
There are more of those too that escape my brain now too. I blame the pregnancy.

If you browse some of the major digital scrapbooking sites, they all have threads about printing, I know
www.digitalscrapbookplace.com and
www.scrapgirls.com both have sections about printing options, which will give you more sites and ideas.