You should watch an area of sky about 45 deg from the radiant and the same distance from the horizon. Memorize its path against the stars and estimate its magnitude by comparing it to the stars it passes close to. You should also keep a record of all sporadics you see as this helps in the analysis. Very bright meteors and those with persistent trains should be documented further. How long did it take to fade.
Sketches are usually quite useful.
Observe for one hour then take a 10 minute break. Don't skip on breaks, especially if you live in the more northerly latitudes where temperatures can plummet in April. Something to eat and a hot drink will refresh you, allowing the observing session to run far longer. Finally, submit your observations to the meteor section of your national astronomical organization. Lyrid obs are few and far between, so your data will be welcome.