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Hi Chino
That telescope is a 90cm newtonian reflector on an Alt/azm mount. The picture shows the finderscope backwards. If you mount it like that it won't work.
The telescope should work OK on the moon and planets with the 20mm lens however Saturn and jupiter won't be very big unless you use the barlow to give you about 70 magnification.
Forget about the erector. If it is a true erector it won't be much use because of the secondary mirror reversal.
If you are looking at the trees etc and the image is upside down this is normal however with the erector in the image may now be the right way up but reversed left to right.
From a dark location you should be able to see some of the bright nebulae. M42 in Orion should give an interesting view.
Barry
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