I second Seeker.
I would check with the school too they will have their preferred method.
Approach Letterland with caution. A lot of primary teachers (me included hate it). A lot of schools are going down the Jolly Phonics route. The actions maybe annoying(I'm currently reliving them through dtwins) but they work.
Jolly Phonics also ensures you pronounce the sounds correctly and has no distractions ie letters with faces on etc. Letterland just clutters the child's brain when it should be focusing on the letter and it's sound.
I just read 100s of quality picture books to my boys and we looked at a quality alphabet picture book once,that seemed to do the job. We had foam letters in the bath too. They just turned 5 last week,have never done flash cards etc. Their excellent teacher now sends all the more complex Jolly Phonics sounds and actions home so we do that as we've been requested to.