Give yourself plenty of time and room to move over into the first overtaking lane when anticipating traffic that is merging from the left onto the motorway. Things have a habit of happening very fast at junctions when you have been sat on a long stretch at a constant speed. Don't undertake either unless you really want to end up in A&E. I would leave filtering to when you have a bit more experience but if you do do it, not at 70mph!