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Hi Tareq. Easiest thing to get started with planetary is to fit the ASI290mm to your current scope (I have no idea what that is) & filter wheel with RGB filters.
You will just need a suitable barlow or PowerMate to get a decent focal length for planetary (around 4 metres, depending on your seeing).
I got started in planetary with an ASI 290mm, a manual 1.25" filter wheel, and some cheap RGB filters on a refractor (FL 840mm), and a 5x PowerMate.
Then I upgraded to a 2nd hand motorised filter wheel, Celestron C9.25 (FL 2,350mm), and a 2.5x PowerMate.
Hope this helps.
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