Here are some a decent idea for choosing and valuing your domain
How many other extensions are taken?
If you own the .com of a domain and the .net and .org are also registered, that’s a good sign that the domain you’ve chosen is in demand. It means the term you chose for your domain is popular enough that people are willing to register it in extensions that are not as popular as .com.
If similar domains are taken
In addition to if other extensions of the domain are taken; also see if similar domains are taken. For example, let’s say you own the domain PickleballHome.com. Pickle ball, which is sort of a cross between tennis and ping pong, isn’t a very popular sport and there are lots of Pickle ball-related domains are available to register. Instead of buying your domain, someone can register PickleballHouse.com, PickleballWeb.com or PickleballPages.com for their website. This makes your domain worth less. Compare this to BaseballHome.com, which is for a much more popular sport. Most of the good alternatives to BaseballHome.com are already registered, so the domain is probably worth more.
Since most of the best domain names were registered a long time ago, the amount of time a domain has been registered can be an indication of value. This doesn’t mean that every domain registered in 1995 is more valuable than ones registered in 2010, but it can give you a general idea. You can see how old a domain name is by locating the “creation date” for the domain in WHOIS.
Search results volume for the term
It’s a good sign if there are lots of results for the search term matching your domain in Google. If you search for pickle ball on Google, you’ll get about 500,000 results. Search for baseball and you’ll get over 400,000,000! Clearly, baseball is a more popular topic. The more people who have created web pages related to a topic, the more demand you can expect for your domain name.
Monthly searches for the domain –
Pages indexed in Google are one thing. But the amount of searches per month for the term can be an even more important measure of demand. You can get an estimate of the number of searches for a keyword Advertising competition – If a lot of companies are buying ads on Google for the term of your domain name, it’s probably worth more money.