There is a plethora of data already on the threads within Notary Cafe. 
If you type ‘RON’ in the Search field, you’ll find loads of very informative & bountiful resources there.
Always check the Search field initially for any query, then (IF you come up empty-handed) create a thread with your question.
Here is a sampling of some of the available threads for you: Search results for 'ron' - Notary Cafe Forums
It will also serve you well to review the following thread:
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IF you discover that a completely new thread DOES need to be created for your question, then include within your original post that a thorough Search of the Notary Cafe forum threads has already been completed & include the links of the threads (at least 1 or 2) with the most helpful info. This will assist us in providing guidance as well as provide helpful info to others who will be viewing your recently created thread. 
You may also want to consider calculating the following overhead expenses even if you’re only choosing RON work. Here are a few to get you started:
• telephone expenses
• office equipment and furniture
• rent and utilities
• paper
• toner
• binder clips
• pens
• stationery and supplies
• business insurance
• business-related meals and entertainment
• professional association memberships
• annual background checks
• annual certification expenses
• legal and accounting fees
• advertising and marketing costs; i.e., Google ads, yellow pages ad, website, business cards, or brochure
Your individual overhead would also include the cost of fringe benefits; i.e., medical insurance, disability insurance, retirement benefits. Also, remember to include income taxes and self-employment taxes.
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If calculating all this accurately seems to be a bit overwhelming, reach out to your tax advisor and ask for guidance in this regard, Ivan. 