About osmosis swap transactions

[d-never]

I want to implement transaction of Osmosis through programming,

For example： I have 2,000 JUNO tokens. I want to swap 1,000 JUNO tokens to OMOS tokens, and set the Slippage smaller than 3%. I have read all the documents of osmosis, but also don't know how to achieve it. Hope to get help, thank you!