help me pls.

sir mein ek retail shop chalata hoon..aur meri turnover 60 lacs ki hai..to kiya jaroori hai ki mujhe g.s.t no. Lena padega....kyunki jaise pehale vat laga tha to sab retailers ne nahi liya tha vat no....aur retail invoice mein bill le kar kaam karte the...to ab bhi aisa ho sakta hai ki 1 July ke baad gst apply hone ke baad bhi bina no. aplly kiye mein retail invoice yaan kacchhe bill mein saman leta rahoon apni shop ke liye .....pls suggest me wright way....aur yeah bhi bata dejiye ki gst lagne ke baad mere jaise retailer ko bhi kiya apni shop pe computerized system lagwana padega ?