I'd take them back, regular baby tears are not aquatic so it definitely won't grow even floating. You can grow this out of your filter if you have a hang-on-back, but I'd take it back on principle of them selling you a non-aquatic. It happens a lot but gosh they simply don't care!
I'd take a page or common aquatic plant I.D. book with you when you go plant shopping, or even better, buy the plants from a fellow planted tank person.
The java fern needs to be tied to driftwood or a rock, the roots can be planted but the rhizome needs to be in open water or it'll rot. The moss balls are easy care, turn once a week to prevent browning and squeeze and rinse every 2-4 weeks to remove debris from the center.