Is it really as simple as print out / sign a contractor legal agreement and then send them the money when they're done? Are there any guides for do's and don'ts when hiring software contractors?

From my research I see that Nolo has a legal document for this[1], but it's US-centric (it's likely I'll be hiring people outside the US). LegalZoom also has something which I may try[2].

[1] https://www.nolo.com/products/independent-contractor-agreement-for-software-consultant-for-firm-noe3-pr231.html

[2] https://www.legalzoom.com/legalforms/independent-contractor-agreement