Congratulations Barbara Kozyra (The Artist Your Views, April 2021 issue), for having the courage to give up the day job and paint full time. Getting started is difficult. However, selling online is only one option, and getting your name and work known is necessary from a very early stage. There is no easy answer and legwork, I am afraid, is essential. You need to find galleries that sell work of your genre and knock on the door and go in, armed with paintings. The gallery may not like your work, or may be oversubscribed with other artists. So try another one, and another...
Tourist towns often have several galleries, if yours does not. You can find galleries by searching online or you can go look for yourself. Offer to show them what you do, either in person or by sending images. Talk to the proprietor: find out what they like and what the commission is. It's likely to be steep – it pays their overheads and wages, but you allow for that when pricing. Look out for exhibitions that you can be part of – the Derbyshire Open is one example. Or join a group or a club that meets and exhibits regularly.