Since I have started playing Kalista its been a little bit of a learning curve due to the uniqueness of the passive. This is due to the passive having to fully attack before you are able to move and since you can't cancel you have to understand what way you want to dash after each auto. But after you are able to get the hang of it she is really fun to play. For me I like to rush Greaves due to the passive dodge range increases with higher level boots. Then depending on if people are already team fighting I go with Runaan's and if not I would build a Mythic. If you build a lot of life steal it becomes a hassle to kill you due to your kitability against the enemy. A thing I would like to recommend is if you dont have Player Attack Move Click bound in settings then I would suggest bounding it. This is due to not having to click on the enemy team while trying to kite away or around them. Downside to this is you can't really use it in the early game unless you are fighting in river since it does also attacks minions. Underneath is a clip of a penta I got using PAMC and in it you can see some of the downsides of using it as well as some things that are useful about it.

https://www.youtube.com/watch?v=qbDgiRFbqV0&ab_channel=RoboticLlama