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All,
Once i fix my toilet base onto my florr tiles i presume it is advisable to seal around the base with some silicon sealant?

You don't need to, but if you do it will prevent any spills from getting underneath it. A good quality silicone should do the trick.

The seal should be water tight and this is usually done by the application of a wax ring. However, when I demolished my 75 year old toilet prior to a remodeling job, I was surprised to discover that there was some kind of rubber seal on the closet flange and no wax anywhere. The toilet had not leaked in 75 years and there was no sewer smell in the bathroom or in the basement below.

Arther are you an american cousin of ours? by any chance!