You will need locks to practise on, it sounds like your plan was to practise on locks that are being used, considering you bought picks without owning any locks to practise on, which we
do not do. If you are interested in the joys of this hobby collecting locks to practise on will be something to get good at.
I would recommend reading the
LSI guide to lockpicking, you can get it from the link on the top of that page.
When starting out, sometimes it is useful to remove some pins from your practise locks to make them easier to pick, to get the feel of setting pins and work your way up to a full complement of chambers. There are many tutorials including one on how to re-pin locks available
hereHappy reading!