Expect to have ideas, basically means that one should be open to as many thought processes and styles as possible. Carelessly disregarding perceptions and conceptions should be discouraged in the quest to generating ideas.
No matter how trivial or silly an idea appears it should merit some level of exploration. Being open to new experiences also helps to broaden ones mindset. Different situations often present different challenges which can eventually be the sounding board for new ideas to be explored.
Develop a habit of noting down on paper the beginnings of ideas before they are lost to other distractions. Often the best ideas simply pop into ones thought process when least expected and capturing these ideas on papers before they are lost helps to further mull on the concepts at a later more leisure and thought concentrated time.
Being thankful for ideas allows the mind to accept the positive and creative reinforcement that works to keep the mind alert to be always on the lookout and exploring. This encourages the mind to produce more and more ideas with ease.