Although I have gained some knowledge from renovating and going to auctions with them I really want to know how I can prepare for property purchasing when I turn 18.Credit score?

.- Deals: Figure out a way to find deals either through the MLS, foreclosure and auctions, Bigger pocket, Drive for dollars etc- Analyze those deals daily using the bigger pockets deal calculator.- Follow the process of landing your first deal - Analyze -> Pursue -> succeed -> repeat..- Once you find a deal with a number that works , Find Investors, connect with your local banks , partner with someone . ( I strongly recommend the book - Investing in Real Estate with low or no money down by BT)- Be consistent- Read Blogs, Read books, read posts- Attend Network events- Connect with one member a day with a purpose(Please: do not spam members , you may loose your messaging privilege).I doubt you will fail if you ritually follow 70% of the recommendations.

I was wondering if anyone had any experience at buying at auction more specifically in California, but any state will do.

I am looking at an auction house in Belmont Park KC MO. 

If you are able to essentialls "save" the seller from getting foreclosed on IF the property is schedule to go to Auction at the courthouse for a later date?

About a week for repairs.  2 or 3 Saturdays going to estate auctions for furniture and appliances. 

Not really, because you don't know what your final price would be until the auction ends, and you generally have to register with the auction site to participate, and many require you to close in cash, not to mention many investors are already looking there so if you win a bid you may be overpaying. 

The majority all my buying over the years has been from the foreclosure auction however the only things that are foreclosing right now in Florida are things like HOA's and code violations due to the Care's act moratorium on foreclosures.  

My properties previously were from MLS and auctions, but now I've added the off-market component and have established relationships with wholesalers so my property selection is stronger.

Look at all kinds of deals Listed properties, Open houses, wholesalers deals, auctions, FSBO, and every other investor's deal you can look at.