Debit income vs contract salary income tax

Dear Experts,

Greetings…

I have few query on taxation..

I am a retired person having simple debt based income, post retirement I just started working as contract basis. Now will my employer deduct any tax from my contract amount and how should I file my income tax return under which form/s showing both debit based income and contract based salary also what would be allowable deductions can I claim.

Appreciate your help.

Thanks

Stephen