Hi !
The best way is platic tube (Evergreen or Plastruc, i prefer Plastruc because it's more solid)
if you can't , the best is , i don't know the term in english language ? , the wood stick used to get plants straigh !
Sail is important if no rowers, if rowers then in fight , the sails are not used ! And then it's less important to have sails with the kit ...