hi Arjun_singh,
first of all let me give u a warm welcome for ur interest in immigrating to Canada and for posting ur query here. let me share what we did w/ our papers.
we got certificate of employment from the human resources, letter states what the duties and responsibilities are, years of employment covered, salary per month or years, (benefit if there is/are), time and days spent (like monday - friday 8am to 12nn, 2pm to 5pm for example). then we attached to support this claim notarized copies of check payments (for services rendered), and service contract.
since we're also into private practise, we also included receipts of dental supplies, letters from suppliers acknowledging they know us, we're their clients for how long already and the kind of business transactions we have, mode of payment. same thing w/ our px, treatment they underwent, mode of payment, and when this things transpired. Comments from them were likewise elicited. We also submitted notarized copies of tax returns, business permits (if u have), professional regulation id, health insurance...
imo, i think it is best to submit along w/ ur app kit, documents proving ur experience (even if they are not mentioned in the document checklist). this is what we did, i hope it helped u somehow and the rest of those who are planning to submit their applications.
another thing,an unsolicited advise, it would be best if u could submit ur application this week and not wait for 2 more weeks. time is of the essence. hope u make it to the cap.