Articleship...

Step 1: After clearing both groups or group 1, you will apply to various CA firms in you city.

Step 2: Then you'll get a call for an interview.

Step 3: You'll then appear in the interview & get selected.

Step 4: You'll then get the appointment letter & you can join from the date mentioned in that letter.

Big4 or a mid-size firm should be decided only by you. Don't take opinions on this particular issue.

Analyse what will suit you better & make a decision.

I wanted to go for a mid-size firm and after 9 months of articleship, I'm really Happy!!!