If you look on the home page of steemit, there are tags in the left column. If you click on introduceyourself, and then click New at the top of the page, you will find a list of the newest introduceyourself posts. Scroll through and find 5 posts that seem interesting to you, and welcome them using partiko. :
The direct link to the new introduceyourself posts is
https://steemit.com/created/introduceyourself
Good luck with Banana Program!