Hi There, can anyone help me?

I have just bought a 1999 honda D. and have spent £650 at the garage
to get it through the MOT, now it has developed another fault, but
can't afford to take it to the garage.

It has two new Avon tyres, but as I am riding the steering feels
restricted, as if it is on a rail road track, when I am at a
standstill, the steering has some resistance when I turn the steering
1/2 an inch left or right - is this because the tyres are new? When
I'm riding, the deauv, falls into the corners easily, but when I lean
left, the front wheel wants to turn right and when I turn right, it
wants to turn left. and if I run in a straight line, its hard to keep
the front wheel running straight.

Many thanks for any help you give me.
Dave