Can i proceed without vat in start-up?

I have started new business as a merchant exporter.

My query is, instead of taking voluntry VAT TIN registration, can I proceed without VAT for now?

Primary reason: Starting with a tight budget.

My point is, later when I register for VAT after I reach the obligatory turnover to register for VAT; can I put for claim/refund of VAT paid on purchases for Exported goods? As I said I am trading, what I buy I export it as it is. Can I apply for refund of VAT of exported goods after I get my VAT registration done?

Please guide.