There are two kinds of approaches. The first is .The second is
有两种办法。首先是……，其次是……。
We can do two things. First, we can lower prices. Second, we can increase sales.
我们可以做两件事。首先，我们可以降低价格，其次，我们可以增加销量。
Only two solutions are possible. One is to reduce our workforce. The other is to cut our salaries.
有两种可能的解决方法。一种是压缩人员，另一种是降低工资。
There are three stages. First of all, Secondly, And lastly,
有三个阶段。首先是......，其次是......，最后是......
There are three main points we have to consider in carrying out this project.
开展这一项目主要有三点是我们必须考虑的。
First of all, the staffing problem.
首先是人员问题。
Secondly, financial support from the company.
其次是公司的财政支持。
And lastly, flexible working schedules.
最后是灵活的工作计划。