I am so sorry for your loss. I really am.
I have lost 2 babies now and had funerals for both. I didnt have much to do with my 1st because I so was numb, but I regretted it soon after and I made sure I did what I regretted with my first with my 2nd baby I lost.
Having the funeral is going to be so hard, but I would recommend doing as much as you can if thats what you feel like doing. I chose poems, the songs, chose what to put in the coffin, what colour coffin etc.
And when I lost my baby girl, I regretted not doing so many things with her with the time I did spend with her. So I did those things with my little boy. Like-taking as many pics as I could-both just baby and with me, daddy, family members. Pictures of feet, hands etc.
I bought a casting mould, and took moulds of his feet and hands, took hair from him, dressed him and cleaned him up. Held him as much as I could....
Hope you dont mind me suggesting this, like I said, I regretted not doing so many things with my baby girl and ill never get the chance back to do things differently.
Be gentle on yourself x x