We have had panels for years. We get money - but I the Feed-in Tariff for new applicants has been replaced with
https://www.which.co.uk/reviews/solar-panels/article/smart-export-guarantee-explained-at2wh8b519s2
If any of your neighbours with similar houses have them, take note of how many panels they have as a guide as to what you could have.
The panels connect to an inverter - which changes the current to ac from dc.
Depending on the installer you may get a separate meter or it will be connected to your existing meter (if it has the option to do that)
Bear in mind that the generation in the winter months will not be as much as in the summer months. On a good day we generate about 26kWh, and our electric use is about 3-4kWh (ie. overnight)
Apparantly the battery will charge during the day and then be used to supply the house overnight - so in winter it won't charge as much. I don't have a battery but was quoted about £4000 for a second inverter (the battery has its on one!) and 1 battery and installation. Additional batteries £2000 each.
Something to watch out for is that some people are finding out that they don't get their feed-in tariff as it goes to the company that installed them, others are finding out that having panels causes problems when selling their house - have a look at this
https://pmpl.co.uk/selling-a-house/selling-a-house-with-solar-panels/
Make sure that YOU own the panels, YOU get any payment and that you are not leasing the panels/roof.