Usability testing doubt

I have 2 doubts about usability testing.

1) For example, if we prepare a scenario for the user create a new conference in the system. We should also inform the data that he needs to use while performing the task? For example if it is a scenario for a user to create a new conference in the system, we should also inform in the scenario description the data that the user needs to fill in for each field? For example:

  • Title: New Post

  • Category: Category

  • etc.. for all the fields the user needs to fill

2) Also if we can't find users that are not representative of the users of the system, for example a conference system if we want conference organizers to perform the usability test tasks but we can't find any, if the system is not complex, have a back end that allows to insert, update, remove, etc. We can just recruit participants that are familiar with sites in general?

If it's OK to use this non representative users, maybe it's better have a questionnaire to check if this users that are not representative (they are not conference organizers) can have the minimum level of knowledge to perform the test. But so which questions should we have in the questionnaire to check if this users, that are not representative (they are not conference organizes) are able to perform the test? Ask if they are comfortable interacting with sites in general is enough?

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