Is this correct?

Hej, mit navn er Diane. Jeg bor i Lagos, Nigeria.
Min mand er Dansker. Jeg onsker at laere dansk*. Jeg har havde en fa lektioner lobet den fortid ti ar**.
Jeg onsker at laere hvordan man*** har en samtale.

*In Danish, we don't write languages with a capitalized first letter - på dansk skriver vi ikke sprog med stort begyndelsesbogstav. 

* This is a too literal translation, if you wish to say "I have had a few lessons in the past 10 years" you would say: "jeg har haft nogle få lektioner i løbet af de sidste ti år" ("havde" is past tense)

***"man" means "you" but you use it to say "I wish to learn how to have a conversation", you'd never say "jeg ønsker at lære hvordan at have en samtale" which is the litteral translation. 

You write "jeg ønsker" to express that you wish which is fine! But a native would rather say "jeg vil" which means "I want to" to make it sound less formal.