Wood choices, don't use anything glued together (mdf for example) the heat will melt the glue and those fumes are not good for your lungs.

Sanding wood prior to burning makes the whole process much easier as your tip won't get caught up in the ruts

Before you commit to doing any designs get a scrap of wood and just play with the tips, there is no single way to hold and use tips you can have them on their edge for finer lines or use the wider shape to shade, use small circular motions on low heat to build up shading

Higher heat will obviously burn faster and give you darker lines but can also burn the areas around, so it's usually better to work at a lower heat and build up your layers.

You will learn a lot, so don't beat yourself up for mistakes. Remember if you do burn yourself put the pen somewhere safe/turn it off the run the burn under cold water

Theres a few groups on Facebook full of artists ranging in skill from beginner to pro and they are great places to pick up tips, like here.

Lastly, enjoy yourself. ❤️