Glad you're jumping into it. Buying my first multi was one of the best decisions i've ever made.
Respectfully if you can get the accurate ARV then your deal analysis isn't as bullet proof as it seems. A good place to get accurate ones is through a relator with the MLS, using propstream to check comps, or something like that. Once you have a good understanding of how to attain ARV you will be in much better shape.
Always be looking for comps with properties that are the same style house, similar bed count, within -10%/+10% of total sqrft age, and then ensure the quality of the property is taken into account.
Also, when analyzing deals be sure to include holding costs, money costs, taxes, selling costs, and so forth.
For finding deals - definitely go out to all the showings you can for off market deals. You can also hand write letters to addresses you drive by that seem distressed. You can find the owners contact info through public record then get their contact through propstream or batch leads.
Funding deals. Your best bet will be to go to you local real estate meet ups and ask around who the hard$/private money lenders. Also, google hard money lenders, start calling and see what they can take.