Seems a very decent plan, good to know your role within the side, and ensure your captain requires you to play this role.
Don't think you should stick rigidly to this, as situations and conditions can invariably be different and will require an alternative approach. Flexibility and the ability to assess the situation will come with experience, but there will be times when a different approach is the best way to go.
For example if you're chasing a decent score and are batting with a lesser experienced batsman that's having a tough time getting the board ticking, you may be required to take one or two more chances than is ideal, but a different approach is better for the side, therefore you may need to shelve your ideal plan.
The rotation of the strike is crucial for an opening batsman. With attacking fields in place at the start of an innings there should be plenty of gaps, and this is seriously frustrating for the bowlers to guide the ball into gaps and get down the other end.
All very true and all good points.
In this case, the plan above was for a two day match where runs are not as important as conservation of wickets for the first twenty overs. At club level and even representative level, a lot of teams rarely manage to bat fifty overs, let alone 70-80 overs in a longer format.
It's highly important regardless of match situation in club cricket to get through to the 15th or 20th over with as little wickets gone as possible because bowlers will get frustrated, tired and second string bowlers will have to bowl overs. That's where you or the middle order can capitalise.
Singles come by nature of looking for them, being able to dab into gaps on the offside or wait for the ball to be on the pads where ticking it around the corner or playing through midwicket is virtually riskless means runs will come regardless of defensive technique.
In one day cricket at club level, I can almost guarantee you that a side who is 50-1 after 20 will more likely post 250 in 50 than a side who is 95 for 4.
But alternately, my plan in one day cricket generally has a shorter time period of getting in - I look to play the first 6-10 overs conservatively, look for singles, turn the strike over but shelve riskier shots - if we haven't lost wickets, I'll increase the momentum, generally by going to cricket shots I know I play well (in my case, cuts, cover drives and sweeping the spinners) while being a bit more forceful on drives.
In this case I'm fortunate that I know my role in the team, so I can prepare properly during the week. From a captains point of view, it'd be great if you can get your team into same tracks of thought, so they know where they're playing on Tuesday (and can get their plans in order during training for the week).
For middle order batsman, you might have two plans - one for being in before the 20th over and one for being in after the 20th. In any case, I'd say give yourself 10-15 balls before you even look to play beyond a basic range of shots, this is the secret to developing consistency and eventually you'll find yourself naturally able to off drive, ondrive and straight drive without risk which will add to your runrate.