To give you the amount of help you need, would take a lot of time of people who are mostly volunteers here on these forums, so instead, I'll try to give you some advice on how to search for information for yourself.
First, if you haven't already, work your way slowly through this:
next, go to thethe WordPress.com support page, enter one or more keywords in the search box on that page related to what you want to know, click the ‘Search’ button and choose from the list you’re presented with.
To do a more accurate search in the support pages, go to Google search, type
then type a space and type a keyword or keywords, or a phrase or two and do a search on that in Google. To get a more accurate search on more than one keyword or on a phrase, enclose them in double quotes. For instance, if you were trying to find information on how to use the Media Library in WordPress.com blog, you could type:
site:en.support.wordpress.com/ “Media Library”
which would get you results quickly.
To do a more accurate search in the WordPress.com Forums, go to Google search, type:
then type a space, and then follow that with your keyword or keywords inside double quotes as before.
The support documentation has all you need to know and if you read the relevant topics in the forums, it should help fill in missing gaps.