Continuity is one of the most vital aspects of learning to fly so doing one or two lessons a month will find you constantly relearning, forgetting and relearning.
Take your lessons a week at a time with several hours each week and without too much of a break between weeks of flying.
This means (as already suggested) having the money readily available ie saved up or loan arranged.
The aviation environment can be an alien one if you have little or no experience of it and immersing yourself in that environment is key to good progress.
There is a lot to learn both in terms of ground study and building muscle memory and confidence - sporadic flying doesn't help that at all.
As suggested by others, if you want in the future to take friends and family flying, go for the R44 so by the time you get to do that you are comfortable and knowledgeable about the machine - a quick type conversion won't do that for you.
Once you are qualified, make sure you fly regularly as skill fade is real - even after 40 years and 10,000 hours I know the difference between flying regularly and not - the basics are there but the finesse (and therefore spare capacity) fade quickly.
Good luck
