☆.A.
When my son moved into a twin bed, we used the bed rails on the side for awhile. Til he got used to being higher (The other side was against the wall.)
O. thing I would NOT recommend is O. of those non-flipping mattresses (just another word for cheaper!) Decide what you want to spend & get the best for the money.
We like Original Mattress Factory products. Very nice...no "sales" gimmicks, etc. Just a good-better-best selection in various firmnesses & materials.