Charade CS 1985... Need Help

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Hi, Everybody
I've got a Daihatsu Charade CS 1985 Model... Sorry to say it's an old car but still it's giving me good services.

Ok, I got into some problems that i don't understand... I need to fix these problems asap..

1. Last time my car got a leakage in the Engine so the engine oil was leaking from the engine. I fixed the engine leak. After that my engine become heated up quite bad. And the steering wheel shaken up while engine running, it's not smooth. Anyway I've changed the Distributor Cap and Spark plugs, radiator water ok. ... Please Help me on this. Last time it was not like that.

2. The car don't have enough electic power. My headlihghts Dimmed, when i turn on headlights the aircon become slow. Do i need to change the relay? Do i need to put Dual Relay? My Battery is new NS60L. Aircon cannot work properly at night when i turn on the headlights.. Backlights also not bright.. When i turn on the signal lights the wiper and aircon become slow also.. Please Help me on this... How do i fix this problem...?

3. Engine don't have enough power. Last time before I fix the leak of the engine.. The car can run upto 140 Km/H.. I can travel lot of places .. around 350-400 Km. distances.. Do i need to change timing Belt.. ??

4. The engine oil last time i've used 10w engine oil but i don't know why the engine oil finish within 15 days.. So now I put 20w-50w engine oil.. which is more heavier than before.. still ok but the engine become heated fast... Actually what power of engine oil do i need to use?? .. my engine is 1000cc.

Now my headache is the engine heating, not enough power, not enough electicity...

Please would you kind enough to help me on this problem... Thanks to all the guys in advance..

Syeed M. Rabin