Hey Martin,
First of all, a basic website can definitely be useful to showcase your services, provide contact details and generally have online presence.
However, if you are thinking that just by having a website you will all of a sudden start getting tons of work, then unfortunately it doesn't work that way.
If you can get a simple website done for a few hundred pounds, then I'd say go for it, but don't expect any miracles in terms of getting more work.
As for lead generation that really works and can provide great results in a short period of time, I would definitely recommend Google Ads.
Mod note: Please do not advertise to members in this way, it's against forum rules and we have platforms for this if interested (advertising@cleanitup.co.uk)Stephan