It sounds like you haven't done any research in the ancestry databases yet. Try it once to see how it works. Pick someone out who was born after 1850 and find them in a census.
When you are at a page in an Ancestry.com database in the WebSearch Workspace, there are a series of links in the upper left:
1) Enter alternative data
2) Report issues
3) View Friendly Printer page
No. 3 above - View Friendly Printer Page, gives a "clean" page that you can copy and paste - but into FACT NOTES. I wouldn't put it in citation text. In the person tab, look at any fact, then to the panel to the right. You will see tabs for Sources, Media (I never place media directly here, but rather in citations), and FACT NOTE.
What is it about Source Citations that has you hung up? And NO, you don't need to manually be entering sources or citations when you research in ancestry databases - that's part of point of using the ancestry database service, it's done for you.
If you go to a US Census 1880 and after, the whole family will be merged for the Name, Birth, and Residence facts for each person in the family - in ONE operation, and also download a copy of the census page linked in each citation. (Families weren't designated before 1880, so merges have to be one person at a time for 1850-1870.
To what I was alluding to before, here is what ancestry posted as source and citation from a census record today:
Ancestry.com, 1860 United States Federal Census (Provo, UT, USA, Ancestry.com Operations, Inc., 2009), www.ancestry.com
, Database online. Year: 1860; Census Place: Mundy, Genesee, Michigan; Roll: ; Page: 157; Image: 157.
Note that ancestry.com is repeated THREE times. "Database online" is unnecessary verbiage. I would rather the source title be "US Federal Census" than United States ....., 1860 is entered twice, roll is printed but no info about the roll, and Provo, Utah is totally unnecessary, and the "image 157" is also unnecessary, etc. As long as one is just putting up web page trees, the extra words don't mean much, but they do to a person trying to print a report on paper.
Aside from these "small" problems, you will love researching in electronic databases. It beats working with microfilms or paper books any day. Unfortunately, there is still lots of stuff out there that isn't digitized yet - particularly wills and probates.