How nice of E Tyler to go to the trouble of searching the 1930 census for your Ambrose, so you could learn that Luther & Birdie were his parents, and that they lived in Campbell Co TN.Even the names of the other siblings -- a very generous act!(Genealogy research depends on sharing!)
Since you seem to be open to suggestions on how to do your own research online, I'll offer you some more.
Writing a query is an acquired skill, and there are ways to make your queries more effective.Now that you have an entire family, with ages and location, to write about, here are some suggestions for writing a query: First, do the math on all the family members, not just Luther.Whenever possible, include a date (or range of dates) and a location in your query's title -- for example, "Luther & Birdie McGhee, Campbell Co 1930 census".(This helps readers know right away if 'their' people are connected to 'your' people, or if they can offer you anything.)Then, in this instance, your query could read something like:"Seeking info on parents and siblings of Luther McGhee.Luther and his wife Birdie appear on the 1930 Campbell Co TN census." Then space down a bit, and list "Luther, age xx, babt 1888/Birdie, age xx, babt 189x" etc -- easier to read if each name is on one line.('Babt' and 'Dabt' are shorthand for 'born about (year)' and 'died about (year).
Now, as for doing your own research, here are some suggestions.I know you're not at home, but you can do quite a bit with the Internet.You can look at Rootsweb's Campbell Co TN site for earliers census, land records, marriages, etc.TnGenWeb (part of USGenWeb.org) sometimes has TN counties that aren't on Rootsweb -- and TNGenWeb has searchable archives.At both Rootsweb and here at Genforum, search (and post queries) in the Campbell Co message boards.
Searching census records is another option for you.You'll see census records on the sites I mentioned above (although some counties don't have census posted online.)Another place to check is Heritage Quest.Heritage Quest is by suubscription, but many hometown libraries have a subscription that library-card holders can use from anywhere.So if your hometown library has a HQ subscription and you have a library card, you may be able to access HQ by going to your library's site, finding the HQ link, and entering you library card number.The really cool thing about HQ is that they have census images, so you can see the whole record.Depending on the census year (different questions were asked), you can get lots of interesting 'bonus' info from the image.
Now that you have Luther & Birdie's names, and their childrens', you can search the 1920, 1910, 1900 (1890 census was destroyed), 1880, 1870 . . ..
You can also search at Rootsweb WorldConnect genealogy database (the same as at Ancestry.com, these are 'Gedcoms', genealogy files posted by people just like you.)For example, you could search on Luther McGhee with Spouse Birdie, or Luther McGhee born 1888+/-2, or Ambrose McGhee with Father Luther (when you look at the search screen, these suggestions will make sense.)
Another place to look is the LDS (Mormon Church) site, www.familysearch.org.They have the 1880 census -- a search for McGhee in Campbell Co TN could be useful.(Remember to try different spellings, too!)
Well, that's a whole lot of information for one post!But I hope you'll try some of these suggestions -- and I hope you have good luck in your search.