Personal type accounts without member invitation options, and organisation type accounts that Can invite, best approach?

I would like in my application to offer 2 signup forms like:

1. Organisations. They will be able to enter there company info and invite other users that will be part of the organisation and be able to see there resources in it. But only the resources from the company they belong to.

2. Regular users. They will not be able to invite other users to there account, It will be a personal only account where they can see there own data only.

What would be the best approach for this? 

I see we have a user model and role column, I don't like this, I want to modify this to having organisation model and user model but not sure if this is wise regarding jumpstart. 
Perhaps better is to have all regular users where user belongs_to organisation ( if its an organisation user ) or does not belong_to organisation ( Regular user ) 

any thoughts on best approach this?

I also do not want to see any other resources other than my own account Im logged in.

Kind regards