Welcome to NP
A few pointers for you.
Having a quick look through the names, it looks like you have fallen into the reg frenzy trap that most new domainers fall into. Buying this many names in your first year is far too many, especially without any sales. Dont buy 50 or 100 names thinking you will sell them all, it wont happen, buy 1-5 names and try and sell them, if you cant sell them, dont buy more, research and learn what you are doing wrong. Just remember if you sold a domain now for $15K, you havent made a profit if you add up what you have spent and your renewal costs.
Spending 14,500 is far too much for a new domainer, set smaller goals, invest say $500-$1k and buy a couple of decent names and then try and sell them for decent profit to end-users. If you do manage to sell them, reinvest that money into more names. If you dont have a good understanding of what makes a name valuable and how to find end-users, you will end up with a lot of names that wont sell. I would spend a few months reading this forum before buying any names. Check our Namebio.com and DNJournal.com to see what type of names sell.
Check and make sure you have a whole list of potential buyers before buying a name, its not use having a name with no buyers? Biggest mistake domainers make is thinking the buyers will come to them after buying an average domain. This wont happen unless you have really good names.
Don't hand register any names, email owners of decent names and find a bargain. These names are available for a reason.
Don't buy names and then just park them or put up a landing page waiting for a buyer.
Email potential buyer individually and ask if they are interested.
Its always better to spend $100, $200 or $500 on 1 or 2 names that will at least sell, rather than 50 or 100 average names that will end up expiring. Quality of Quantity
Focus on a niche you are familiar with
Focus on a laguage you are familiar with, translating english words directly to german words doesnt always work, ask German speakers on here. Don't buy .DE names unless you understand the German domain market.
Focus on getting the best .COM names in a niche, even if you have to pay a bit more.
Stay away from .LA, IM, Org, MD, and especially those gtlds as well like .Deals, Kaufen, Credit etc, most end-users have never heard for them. A lot of new domainers say they believe they will take off, remember its what end-users do, not we what domainers believe, have a look at the Gtlds sales over the last few years. Stick to what sells.
Shorter is better in domains, most of the time anyway
Dont mix numbers and letters
Stay away from hyphens
Stay away from company names/Trademarks
Any offers you get on these, sell them and learn more about the industry and then reinvest. The 5000 and 2.200 you got offers would be fake offers or appraisal scam offers, not real offers.
These domain dont sell, they are fake offers, the reason they dont get paid for is its just people placing fake bids or hitting the BIN button with no intention of buying the name. These are not legit buyers who decide to back out of a deal. Dont count them as legit offers.
Hope that helps
Good luck