The phrase 'mark the first step' is correct and can be used in written English.
You can use it when you want to indicate the beginning of something. For example, "When she received her first paycheck, she knew she had marked the first step in her financial independence."
Hopefully, Sunday will mark the first step in that direction.
Riyadh's view was that the deal could mark the first step towards a comprehensive solution for Iran's nuclear programme "if there are good intentions".
The informal talks, initiated by the US, mark the first step forward in the Obama administration's attempts to break the deadlock in Middle East peacemaking.
If Wednesday's match does mark the first step along the road to full recognition, a whole new set of eligibility issues will come into play.
If the current model was successfully adopted in the urban planning process in Malaysia, it will mark the first step for Malaysia in taking specific considerations on the issues of CO2 emissions and global warming in the urban planning process.
In the words of one Catholic bishop, the proposals mark the "first step on the road to a culture of death .Ireland's stint in the rotating presidency of the European Union, which began on January 1st, has focused renewed attention on its abortion laws.
10am, and Seb Coe, Colin Jackson and others welcome Olympic fans and athletes off the train at St Pancras and have their footprints cast in clay 'to mark the first steps' to the Games.
10am: Seb Coe, Colin Jackson and others welcome Olympic fans and athletes off the train at St Pancras and have their footprints cast in clay 'to mark the first steps' to the Games.
These accomplishments truly mark the first steps in understanding the growing gray seal populations in the US Northeast.
These studies mark the first steps toward unpacking common discipline-specific epistemological stances in introductory biology courses.
Her court victory on Friday marked the first step in that process.
