is there anyone willing to help me?

Yeah sure, what questions do you have?

Hi. First question is: can I use llama2 with llama-index?

i have models downloaded

second question. I watched youtube videos. People are using some kind of graphical python tools to write prompts. Which ones would you recommend? I have Kubuntu 22.04 and winblows installed, would like to try both

Yeah you can use llama2 and other open source models: https://docs.llamaindex.ai/en/stable/examples/vector_stores/SimpleIndexDemoLlama2.html