Glad you got one..now the fun start's.............first off that sealer look ok to me, they are a bit messy I've found but once theve set should be ok,
Chimney starter? I wouldn't be without one...they are a great bit of kit..https://www.google.com/search?q=Charcoal+Starter&client=firefox-b-d&source=lnms&tbm=shop&sa=X&ved=2ahUKEwidmfiwudLwAhUbCWMBHZERAfIQ_AUoAXoECAEQAw&biw=1366&bih=626
Easy way to start the charcoal chimney is on a small camping stove, a lot of us use them...https://www.amazon.co.uk/Clas-Ohlson-Portable-Single-Camping/dp/B086N2PFZ7/ref=sr_1_31?crid=383AJOB1H42R0&dchild=1&keywords=gas+stove+camping&qid=1621314158&sprefix=gas+stove%2Caps%2C271&sr=8-31
Seasoning is where you start a fire and just let it heat up the smoker, it can help to clear any "crap" left over from when it's made.
100% on doing this, running an offset can be a tricky one at the start, give it a go by all means, but hey throw a few chicken wings on they don't cost a lot and you get to have a snack into the bargin.....best of luck..
Ice.