First off, welcome to domain investing.
Next, real good money can be made but you have to be willing to spend the time to do it. Since you are new, the best thing to do is to read everything you can about the field. Reading and research are the keys to making money in this area. If you have any question, which you should, just ask others and weigh what is said.
Everyone thinks they are going to jump into domaining and get rich right away. If that was the case then everyone would be doing it.
Just read, research and listen to those that have been in the field and you can do very, very well.
DO NOT, listen or take anything an automated appraisal gives as worth anything more than just entertainment (at best), especially estibot. This forum and other like it have people coming here all the time thinking they hit the jackpot because the registered a domain that estibot says is worth something good.
Don't be disappointed, just look at the money you spent on your domain/s as a learning lesson.
Also, be careful with registering any domains where there are potential Treademark issues. Many people make the mistake and doing this and it can cause serious financial and/or legal troubles and they are not worth the risk.
You newbigbang.com has a potential Trademark issue, depending on why it was registered and what it is used for. The TV show Big Bang can cause you or another problem sometime down the road if it's used for purposes that relate to the TV series.
As long as it's not used for TV related stuff, you'll more than likely be fine.
Good luck and welcome to the world of domains!