If your wishes are that, at your service, there is no mention of ‘God’ or an afterlife, then a Humanist service would suit you best and there are many Humanist officiants that will create and deliver your service for you.
However, you should always bear in mind that there may be members of your family, or the within the congregation generally who DO have a faith and who you might not want to upset by denying them the opportunity to offer prayers to their God. A nice touch is for the officiant to invite members of the congregation to spend some time, possibly during the playing of a piece of gently music, that the congregation can spend thinking about you and the difference you made to their lives and that this might be a good time of anyone with a faith to offer their prayers to their God. This of course has no perceivable effect on the overall service so ‘Humanist, Atheist and Agnostic views are respected.
People are often confused about the terms Atheist and Agnostic. To clarify, if the answer to “Does God exist?” is:
“Yes” then this would imply theism, “No” would imply atheism and “I’m unsure” would imply agnosticism.
A humanist service might speak of the cycle of life, the genetic code passed through to future generations, the difference that you made to others n your time with them and what you might be remembered for.