In the header:

List your sex (yes this is a Subreddit for men but keeping the format is important).

List what/who you are looking for.

List your age.

List your ad title (what you are looking for).

List one or more of the following as they apply to your ad: H = Host, T = Travel, H/T = Host or Travel, P = Meet in public, or N/A = Negotiate Arrangements.

List if you are open to communicate via: CH = chat, ME = messages or, C/M = Chat or Messaging.

If you are hosting, please make sure that you list the area you are hosting in, burb, city, neighborhood, etc.

An example of a header for an ad:

50M4M, Looking For A Buddy To Talk About Guy Stuff And See Where It Goes, H/T, If hosting, Dog Town, C/M

Next, Write your ad.

Finally: Flair is not required, however it may make things easier for others to search by.