You need to check the project first, read through all the information that are there and check the names behind the project. Presentation and transparency are extremely important. Also, check the effort that developing team is invested into it, it is an extremely good sign when you see that the devs are still committed and constantly improving and upgrading it. Also, some base factors like CMC, community, availability on the market, daily activity of the members. There are all major factors. The project that I am looking at for couple of weeks now has been BTCN. It reached CMC in no time, community is incredibly active and it is already present in a couple of credible exchanges.