I play a lot of these, especially on FullTilt. In essence your beginning stages are going to be push-fold. you're already at less than 10BB so even in a normal tournament it would be time to start shoving.
As for range, you need to really expand it to include some junk when you are unopened and in position. If someone shoves in front of you, you should only reshove with premium
hands. If you play the 54 man on FT, if you can double up twice you should make it to the final table. If you double up once and you're above 10BB's, often a 2X bet will take it down in position with smaller stacks behind you. I recommend playing multiple tables and waiting for optimal times to shove in the early stages.