Is this possible to write
At the beginning I have bought some records from him. Then one day I asked for a record he did not have ,he answered to me that he was OK to let me use his address and since then I have used his address. All records bought in the USA are delivered to him.
In the first sentence what puzzles me is that I use "at the beginning "with present perfect because the beginning of this action began a long time ago .But it is still true at the time of writing . I still buy records from him so I think present perfect is fine.