Hey,
Welcome to DNForum!!
I think the best place for you to start is by reading the threads under the "Domain Beginners and Newbies" section of the forum. You will gain a lot of insight about how the industry works.
Thereafter, you need to witness what has sold in the past years, what has sold recently and at what prices and also, what people are willing to buy.
Biggie has given a very useful advice. Read the threads that he has suggested. Read all that you can, as a newbie, understand the market and then move further.
Before that, do not invest any money in the domain names. A big part of domain flipping is knowing how to sell.
Do you register all domains yourself??
If you mean hand-registration by that, then yes, I do go for hand registrations besides acquiring expired domains.
What could I be doing to more actively sell my domains?
Read a lot, acquire the required knowledge and then go for flipping it. Unless you know how to sell, it is very difficult to survive in this industry. Therefore, my sincere advice would be to read all about finding end-user, how to contact them, etc. Also, you may go for flipping it on the forum. You may post your names for sale.
Which domain registrars do you use?
I prefer GoDaddy for my domains.
