I won't have any transactions from my side in the beginning, it will be only to interconnect different nodes and create better routes, later i may open some channels for transactions as well?
You might find
this Lightning Network node explorer useful for choosing which node to open a channel with.
How about paying for campaigns trough LN? What you think, opening a channel with the campaign manager and close it when the campaign is over, just to boost a bit the LN?
I am quite sure we have already discussed it at some point in the ChipMixer Signature Campaign thread. There is no need to open a direct channel to the campaign manager. Connecting to one of the most popular nodes would be enough (I'm not suggesting anything more complicated since I am quite sure that most campaign participants wouldn't bother that much). The participants would have to spend their earnings in order to make room for future incoming payments. That's the biggest problem. Also, the campaign manager would have to either use a third party service to refill the channel or open another one.