Your vows are an important part of the wedding ceremony and the memory of them should be with you throughout your married life together. Your vows are the key promises that are the foundation of a happy marriage.
Consult with the marriage celebrant to check out the requirements as far as vows are concerned. Legally there could be a couple of important words that need to be included in the ceremony and your marriage celebrant will be happy to advise you.
If you decide to write your own vows it can be difficult to get started but bear in mind they should be simple but meaningful.
Discuss and agree with your partner whether you'll both say the same words or each write individual vows. However, you should agree on the general tone such as romantic or light hearted.
If you are stuck for words write from the heart. Think about what you love most about your fiancé, what are his special qualities, why do you love him and what does marriage mean to you? You might recall a special memory you share or talk about when you first fell in love.
Your vows shouldn't be too long. Write a draft, read it aloud to friends and adjust until the words express what you want to say.