Perhaps some more specific instructions could help from my side - sometimes we forget that everyone is a beginner at some time. What I did try to do is package every single skin with the container as well - and also in the download, provided the original skin file which I worked from. Some of the original containers and skins don't actually work on DNN so well, but it was important to keep them there as recognition for the original authors.
Without wanting to complicate things - I'll try to explain how it works -
If you have a skin and a container pacakge together - you zip up each skin file in a 'skins.zip' file and the containers in a 'containers.zip' file and put those two files together in another folder.
You name that folder what you want the skin name to be - for example - XDNewOne - and zip the skin.zip and container.zip files up together so they are in effect - a zip in a zip.. the outer zip file would be called XDNewOne.zip and looking inside it - you'll see two folders called skins.zip and containers.zip.
DotNetNuke knows that this format will automatically upload to a skins/XDNewOne and containers/XDNewOne 'package'. That's called created a 'skin package'
That's different to indifividual files - sometimes we create skins only - with no containers - so we would be calling the skins.zip file XDNewOne and uploading that as a 'skin only'
And if we had some containers we made separately - we could also call them XDNewOne - BUT what you have to look out for here is the dropdown menu when uploading them.
You would need to Select the Skins button from the dropdown menu - and it would upload and place ONLY in the skins/ folder
And if you had containers - you would need to select containers - and it would upload ONLY to the containers folder.
What makes it a little more confusing is that many skinning people don't bother to make the 'skin package' they just package them so you need to upload containers separate to skins.
I do have some resources I would like to share more - but am waiting for our new support person to start since I simply don't have enough hours and resources in my day to put all my information online, and have been working for the last 6 months to change things - and now I can see that help is only a couple of weeks away.
So, if you make a mistake like this - and you CAN'T use your site - you'll need to use ftp and delete the folder, which will force the default skin to show up with an error on it - but you can at least see the site again.
You can NEVER kill your dnn site if you break the skin - but you can make it a bit of a mess.
Does any of this help clarify things?