I'm so sorry for the loss of your friend.
Sounds like you are where you need to be -- right here, and asking for signs from your friend who passed. Sometimes folks, like yourself, who have "arrived" here have been guided by their passed friend or loved one! :)
It's early days for signs, but you will get them, I believe. Ask for a specific sign. You might see a license plate or sign on a truck or building with that person's name, or perhaps the name of their business. (Perhaps -- "Go fishing" on a sign board, as a sign of something you enjoyed together.)
You might hear a song on the radio with something in it that makes you think of your friend -- some close tie you've got with that person.
On this website at the left are some "buttons." Click on "About this Site." Then click on "What is an ADC?" and "Sample ADC's." Often we're unsure exactly what kinds of signs to look for. This just gives you some more information, so you can really see the signs that are being sent! Perhaps a bird or butterfly, coming right up in your face, etc. We get some amazing signs sometimes!!
Good luck in your quest. We'd love to hear of any signs you receive. Your signs are a blessing to all of us, as it reaffirms our loved ones are still alive on the Other Side.
Blessings and peace to you.