10500RM is good salary?

1. Yes, it's a reasonable salary* - may be able to save about half if careful with expenditure.
2.  Usually its a fairly tough work environment but sociable lunch hours for example
3. Plenty of accommodation in Cyberjaya
Check for pricing options on www.iproperty.com.my
4. Always veg options but not necessarily at a fully veg outlet
5. You can apply for a Social Visit Pass (Long Term) for your parents - check it out in this guide https://esd.imi.gov.my/portal/pdf/TC-ES … r-2017.pdf

*28% income tax for first 182 days in any calendar year**, then low resident rates
https://www.pwc.com/my/en/publications/ … oklet.html

** need to qualify each calendar year with 182 days in Malaysia. If this is not possible because starting work after July, then 2 tax years can be linked.

Any overpayment of tax between non-resident and resident rates can be reimbursed according to T&Cs provided at the above link to tax brochure.