Blowflex bike

What are your training goals?

If you gave more information you could get advice targetted to your situation, no idea where you are starting from. You could be currently completely sedentary and low fitness level or a highly trained regular exerciser.

Although cycling can and does strengthen legs it's an inefficent way to do it and the results are limited. A regular cyclist will have strong legs compared to the general population of course but way down on people who do resistance training.
That's why bikes are regarded as predominantly cardio equipment with a resistance element.
You would have to simulate hills to get the most strengthening effect (high resistance, low cadence, lots of standing cycling).

"Lose your stomach". You need to think very carefully about that as it's a calorie deficit that drives fat loss (your diet in other words).
If you are thinking to boost the rate of weight loss you selected then that could be counter-productive for your health and if you have already chosen the optimal rate of loss (hopefully) then why are you trying to change that?
If on the other hand you are eating at maintenance calories and then are thinking of using the bike to create that deficit you are heading down a really boring route! Plodding along every day for long duration at a rate that burns a modest amount of calories but doesn't cause too much stress on your muscles to enable you to train every day, possibly for hours. Unless you are a fit and powerful cyclist (what is your average power output in watts for a modest effort?) your rate of calorie burns won't be a lot so you would have to compensate by long duration.
For illustration I can burn 500cals/hr very comfortably but I'm a 5,000+ miles a year cyclist, your comfortable pace might be 250cals/hr.

And you might notice you now have two completely conflcting styles of training! High stress, short duration v. low stress long duration.

I would suggest using the bike for what it's designed to be used for - improving your CV fitness which would optimally involve a whole mixture of intensity and duration.