I can't really comment on putting the pullups on the right way- we use the huggies with Cars characters on them and the big white area is in the front and seems sort of obvious. However, what I can say is - pullups did nothing for us. We do use them at night, but as far as daytime potty training, our son felt like he still had a diaper on so he might as well just pee. So we went right from diapers to underwear. I know others who have had success with pull ups but we weren't one of them...
As far as putting them on backwards - my son sometimes does this though he's been in underwear for 9 months already. My husband explained to him that the front of the underwear have the "pee pee hole" - not so crazy about this terminology but he definitely got it. Of course, he puts his pants on backwards too sometimes. He'll figure it out eventually!