First you must make a hoe. Then hoe some grass blocks and you should harvest seeds. Next go near water, hoe dirt blocks and (having the seeds in your hand) tap on the hoed dirt to plant seeds.
Nyan
In the minecraft pocket edition you cant get seed because in the computer version you get seeds from tall grass and there is no tall grass in the minecraft pocket edition
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Thebogsofgob
All seeds have lava lakes
You have to go to the nether and collect them.
You need to get the nether reactor core to get it
it is random generation
In Mine craft pocket edition the seed spinny is a good one you spawn on a tree you mine the tree and under it keep mining and you get coal iron gold and diamonds or you can look up seeds on google or youtube.
make a hoe and just keep hoeing random grass blocks eventually you'll et a seed
You cannot make your own seed all the seeds are random not hand made