Second row as they are generally tall and strong I but u could play any position I went from playing wing my grade 9 year to playing flank my grade 10 year I'm small even do a wing I'm 5'2 and 54 kg I'm the second smallest on the team and play the most complex position on the field
I am going to guess either a prop or a lock (2nd row) in the scrum
i would guess they will put you in "prop" position number 1, 2 or 3