This is not that hard.
1. Use long range bombardment (nuke or inferno) over the bridge to the east.
place a few bunkers and gats (with mines) on your side of the bridge any ground attack will be taken care of
2. get some Tank hunters a few red guard and Black Lotus and fly with helix into the village to the north... fill the buildings with as many tank hunters and red guard as you can to keep away pesky air attacks. use lotus to capture oil rig. Time your arrival so to avoid the patrol. For best effect, try to do this at the same time as step 1.
3. Cnce you have this basic defense set up concentrate on attacking. ground assault to the east via the bridge. you may need to make a FAST assault on the first superweapon reset building.
4. Set up a second base with power, barracks, war factory and supply point at the supply dock to the east of your base. from this second base you should be able to use the choke point to the north to obliterate any incoming armour, BOSS will likely now target your 2nd base with air. be sure to move your bombardment units to the town north of your base to attack enemy defences
5. Build units, attack, repeat as necessary
(do 1 and 2 at the same time)