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What's called a "tracker" usually applies to small portable devices designed primarily for using with a DSLR & lens or a small, light scope, generally maxing out at around 5kg payload. They only track on a single axis (DEC) and require you to manually point the camera/scope at the desired target first. They ARE good for what they are designed for but I found them restrictive & really for not much more cost you can get a better mount.
A GOTO EQ mount has higher load capacity - most common ones for the amateur astronomer are between 10kg and 20kg - allowing larger scopes & other equipment (guide scopes & cameras, focuser's, etc) to be used and move in both DEC & RA axis's.
As I said earlier, your current lenses will be fine for starters unless you really think you need a scope straight away. They have no problem with a lot of popular DSO objects - they work perfectly well for things like Andromeda, Orion, Witches Head, etc - it's not all about focal length but the field of view & the light capturing ability.
Cheers.
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