I don't think you'll be able to attack any of the WN positions with tanks or infantry until turn 3. Movement off the beach is very slow until those HQs, Generals and Heroes show up.
In my experience, in the first 6 turns you are doing your best to get into position for when those HQs arrive - get out of those intense fire spots, take out as much of the lower WNs as you can and find the best hexes to climb the bluffs. With so few movements allowed per turn, stacking key, even at the greater risk of attack. Tanks are good to draw fire because they are harder to hit.
Best of luck, soldier.
8.4 Conducting a Barrage
A tank unit may conduct an action to barrage a German-occupied hex, if the tank unit is in range of but not adjacent to the target hex, and either of the following are true:
The tank unit occupies a hex in the field of fire of the target hex.
In Easy Fox surely this means on turn one that a tank that drifted to FG3 then moved into hex 0510 could barrage WN 60 61 62 as they have field of fire in its hex.
I'm just learning so may be wrong.