How do I get Clients for my Design Agency ?

Here are a few small pointers for free:

• You aren't selling design work. You're selling a business result. Part of that may involve you doing some design work ;)
• Your email address on the landing page is @gmail.com - that's not very professional.
• Your 'our work' examples don't have any context. Don't just show me some screenshots to stuff you've designed, tell me why the work was effective for the client. In terms of $ added, not 'client X now has a prettier website.'

Good luck.

Step one is always to reach out to your past clients and ask them for referrals. Those kinds of warm leads brought to you by happy customers are worth their weight in gold.