You can provide these materials in the nesting area. Gather eggs soon after they are laid. Most birds lay about every second or third day. Be careful when gathering eggs. Some of these birds, especially ostrich males, can become quite aggressive during the breeding season, diligently protecting the nest.
Egg collection is easier if the nesting area is placed where gates can keep the birds away.
Although these procedures may be of some benefit, they are used sparingly in the poultry industry, with a great deal of quality control. They have not been proven to be safe and effective for ratite eggs, and should not be used. Allow eggs to rest and cool for at least a day before setting them in the incubator. Most growers store ratite eggs at high humidity during the period between lay and set. Again, there is no solid evidence for this requirement, but chicken and turkey eggs hatch best when stored this way.