I'm new to beekeeping so I mostly lurk and learn. I have built two top bar hives and installed bees into both with no problems. One was a 'crop and chop' from a nuc and the other was a package install. The package was three weeks ago, they're drawing comb, making babies and putting up groceries.
This is what I did that worked in the top bar installation. At a location close to the bee entrance I took an old (empty and clean ) piece of brood comb cut to fit the hive and wired it to a top bar. I took the syrup out of the package (and put the lid back on) and placed the package in the hive with the opening up close to the comb but not crowding it. Took the queen cage out and with a thumb tack I attached the queen to the top bar next to the comb so that the opening of the queen box wasn't blocked. The queen package came out with a couple hundred bees clinging to it, I left them alone.
My hive has a syrup feeder built into a follower board which was placed about six inches from the opposite end of the box so the bees had room to move but not exposed to the whole hive, close to two feet I guess. They will need syrup and mine went through about a quart a day for a few days (50/50.)
I bought my package from a local keeper and his advice was to leave the queen cage plugged for two days then pull the plug to expose the candy. Then leave them alone for two weeks. When I went in to pull the plug I removed the empty bee box.
There was plenty of activity for four days around the hive entrance with cleansing and orientation flights so I knew they were ok but not peeking in for two weeks was hard.
Like Rob said feed them.
Hope this helps.