I don’t know how far you have got, but I installed my solar hot water system myself, purchased from Navitron in the UK. [https://www.navitron.org.uk/]
On the site, they have a Forum, like this. There are lots of people on there, some installers and many people like yourself. The help and advice is free. You shouldn’t find people on there talking rubbish. If they do, they’ll be given short shrift by other, more knowledgeable members.
They sell solar pv equipment as well.
We had a solar pv system installed in 2011. The contract for selling electricity to EDF runs until 2031. After that date, I don’t know what will happen, but the panels will still be generating electricity. If we are still here by that time, I’d be considering installing a power wall to store the electricity.