Before deciding to do crowdfunding, have you really set your projects ready? Actually, you need to do your own research based on your project and team condition.
1. Commonly, there are 3 general stages in crowdfunding or token sale of the new projects. They are private sale, pre-sale, and also public sale. But of course, do it after your idea is really ready and having a good beta version is preferable. It will also help you while you are also developing your community.
Private sale is conducted to attract more funds for business and it is gained from the specific investors. This is also commonly done if you experience a lack of investment.
2. Choosing between ICO and IEO. Both have positive and negative sides. You can read more about the advantages and disavantages of ICO and IEO on this
https://www.mobiloitte.com/blog/ieo-vs-ico-which-is-the-best/ or other sources are also available.