You're doing the right thing in this respect... You need to ignore idiots who suggest playing fast and loose. Especially DWP; he's just some sick kid who's been posting BS posts here for weeks... And it's high time he was banned!
You have the numbers... You now have to make them work!
Now; I'm assuming here that you're properly qualified in Web Design? If not you should seriously think about addressing that issue. It's fairly common for unqualified web designers to have huge gaps in their knowledge that lead to them making dangerous mistakes.
Next thing to realise is that many of your competitors will be undercutting you because they're not legitimate. You need to distance yourself from that and pitch your service accordingly.
Don't 'fall in love' with your business idea. That's a fairly common source of failure....
My own Father once fell in love with the idea of owning a sandwich shop; don't ask me why! Common sense and market research told everyone but him that the only place his plan would work was in the middle of a city or medium size town were shop rents were relatively high. And those high rents caused the numbers to keel over. But so determined was he to open those doors that he set up shop anyway... Miles away from any industrial or shopping centre on the edge of a housing estate!
Likewise there's an empty shop unit in my village which was leased some time ago by someone wanting to set up a hairdresser/beauty parlour... A village of 3000 people isn't the place for that particular dream!
Be prepared to walk away from this plan if you just can't make it stack up...
And finally, you need to go back and look over the posts where people HAVE tried to point you to the right support mechanisms...