Maybe look up a speech example online and then translate that into Hmong.
Or you could start off like this:
Kuv tsis muaj ntau yam hais tab sis kuv xav ua tsaug rau cov kwv tij neej tsa thiab phooj ywg sawv daws uas nej muab nej lub sij hawm tseem ceeb tuaj nrog peb koom pluas mov no thiab. Ntxiv mus, kuv yuav tsis tuav nej ib leej twg lub npe tab sis kuv ua tsaug thiab zoo siab rau tas nrho cov niam tsev, cov niam hlob thiab niam ntxawm uas tuaj pab peb ua pluas mov no. Kuv yuav nco ntsoov nej tej txiaj ntsig. Hnub qab nram ntsis yog nej hu tuaj txog kuv los kuv yuav tuaj pab nej thiab.
Gotta remember to thank the guests and the people who helped your celebration.
Now onto mil, you could start off like this:
Niam, ntawm no kuv yog koj Nyab [insert husband's name]. Kuv zoo siab tias kuv tau los ua koj nyab. Koj yog ib leej niam zoo thiab ib leej niam muaj lub siab loj siab dav. Koj txawj hlub peb cov me nyuam thiab koj txawj qhuab qhia kom peb ua neej caum tau lwm leej lwm tus. Peb yog me nyuam xwb, tej zaum peb yuav ua pauj tsis tau koj tej txiaj ntsig. Tab sis kuv xav hais rau koj, kuv niam, tias kuv hlub koj. Tej zaum muaj qee zaus kuv ua tsis raug koj siab los nco ntsoov tias kuv yuav hlub koj thiab ua raws li qhov kuv txawj. Muaj kev tu siab dab tsis los nco ntsoov tias tseem muaj kuv ua koj nyab. Kuv yuav hlub koj.
Something like that. I've had to make several speeches to my mil in front of people and sometimes just to her. Nobody trained me. Just had to do it from the heart.