Marko, marine charts for your area should give you an indication of tide strength and direction. There may also be publications for your area with more comprehensive inshore tidal data than shown on the charts.
Generally speaking currents will be much stronger around headlands and in areas where water is funnelled (eg entrance to estuaries). In my area (Dorset) we have a double low tide west of Swanage and a double high tide east of Swanage. This is due to geographical features of the area.
The strength of the tide will also change throughout the tide cycle - in general the mid tide cycle is the strongest part. However in some cases it may be the last hour or two of the ebb or flood where the tide is at its strongest.
Spring tides will give currents around double the speed of neaps.
Which area do you plan to paddle?
I use electronic charts which contains tide times and current data - plus I have Peter Bruce's tidal info books for my area (Solent and Portland - St Albans Head).
http://www.memory-map.co.uk/acatalog/maps_uk_atsea.html