Hi
Search in the web
"How to teach a weedwaker to fly" by joe Guzzardi
jagengines
Read the engine conversion forum and see the photos.
Read the "dont forget echo" here , many photos.
If you are a beginner and have no person or chainsaw repair shop can help you , start with a new engine to avoid frustration, you have a new carb and new ignition.
Good luck
Jose