Good morning, @knissy. Immunotherapy for lymphoma is fairly common and beneficial. But when it’s new to you, there’s a lot of questions I’m sure! I had them too. I didn’t have lymphoma but another form of blood cancer and infusions were part of my life for quite a while.
Not sure which medication you’ll be receiving. There are different types of lymphoma with drugs to match the disease.

I’ve found a discussion that might be helpful for you!

This conversation picks up in the middle of a discussion on Staying Strong and facing an uncertain future. Most of it won’t apply to you but the link I’m posting starts with a conversation with @valandsheri when her husband was about to start Rituximab/ bendstamine infusions for lymphoma.
Here’s the link…keep reading through the next few replies.
https://connect.mayoclinic.org/comment/807392/
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With your non-Hodgkin’s lymphoma, did your doctor discuss which type of immunotherapy they’d like you to receive?