You've come to the right place!
If you'd like to advertise your property on Malaysia's No. 1 Property Website, you'd have to engage a real estate agent who has an account with PropertyGuru to list it for you. This is because only certified Real Estate Agent (REA) and Real Estate Negotiator (REN) can post properties on this website.
You can engage the agents who've reached out to you here, or look for agents who specialise in the area that your property is located by searching for agents registered with PropertyGuru here: https://www.propertyguru.com.my/property-agents
You can ask a real estate agent or mortgage broker for an indicative value. Apart from that, you could engage the services of a registered valuer for an official valuation report for a fee. For example, you can refer to http://my-property.com.my/
Usually, a bank-appointed valuation expert will arrive at a final valuation of a property after taking into consideration recently transacted sales of similar properties, and also inspecting the property to know more about its current condition.
Here are some insights on how property valuation works: https://www.propertyguru.com.my/property-guides/how-property-valuation-works-14584
All the best in selling your house!