Good stuff mate, it is an enjoyable relaxing game to grind up the levels. Personally, I just cared about whatever the highest Power level weapons i dropped until around 260ish. That way I purposely tried out all guns along the way. If you do find something you love using, like an AR, just infuse any higher levelled ARs into it along the way. You'll dismantle shit loads in the process. If you get a high exotic just keep a high legendary as a back up. If you switch exotics, you'll need back up legendary gear to replace the other one. Lastly, just open all legendary engrams, with the exception of Powerful 'Illuminous' legendary engrams. Regular ones the power level are set at the number you pick them up. The others will move upwards with when your Power level goes up.